ML19247B830
| ML19247B830 | |
| Person / Time | |
|---|---|
| Issue date: | 07/17/1979 |
| From: | Fabic S Office of Nuclear Regulatory Research |
| To: | Butler W, Lainas G, Paulson W - No Known Affiliation, Office of Nuclear Regulatory Research, Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7908130592 | |
| Download: ML19247B830 (59) | |
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JUL17 ;g79 Those On The Attached List Gentlemen:
Subject:
Meeting Minutes of the Containment Code Review Group Enclosed you will find the meeting minutes of the Containment Code Review Group which took place in Silver Spring on June 19, 1979.
Sincerely, wp-t'- 4 S. Fabic, Chairman Containment Code Review Group Division of Reactor Safety Research
Enclosure:
as stated 7 9 0 813 05D,
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Addressees of Letter Dated W. Butler, NRC G. Lainas, NRC W. Paulson, NRC J. A. Kudrick, NRC N. Zuber, NRC R. Cudlin, NRC C. Anderson, NRC C. Grimes, NRC G. Mansfeld, NRC Consultant A. Sonin, MIT D. Norris, LLL E. McCauley, LLL J. Lehner, Bf'l J. Block, CREARE V. Dhir, UCLA L. S. Tong, NRC U DR (2) b
CONTAINMENT CODE REVIEW GROUP MEETING MINUTES Place and Date: Silver Spring, MD June 19, 1979 Attendees: Attachment 1
==
Introduction:==
A meeting of the Containment Code Review G-oup was held on June 19, 1979, in Silver Spring, Maryland.
The proposed agenda enclosed as Attachment 2 had to be modified, because R. Cudlin (NRC/RES) and J. Pitts (LLL) couldn't attend the meeting.
Description of foreign experimental programs by G. Mansfeld (NRC/GRS) and E. McCauley (LLL) was confined to the GKSS multivent experiments. Analytical description of chugging and intercompartment flow tests were not discussed.
Conclusions and Reconmendations:
S. Fabic provided the status of the current RES containment programs:
The UCLA program will be terminated end of FY 79, per previous recommendations of this review group.
The MIT program will continue into FY 80.
The BEACON code will undergo extensive verification during FY 80.
RES has incorporated intercompartment flow tests in the FY 80 supplementary and FY 81 budgets. Such tests were reconmended at the last review group meeting.
RES is closely following the BWR tests at GKSS and JAERI.
The PELE-IC code will be completed soon.
S. Fabic was asking for support by NRR in planning the containment program for FY 81.
RES is looking for open issues. Research issues coming out of the TMI accident seem to be in the areas of vented containments and of the hydrogen behavior within con-tainment building.
W. Butler stated that NRR will forward their recommendations as soon as possible.
Furthermore, he said that NRR may come up with other issues in the area of containment research (such as containment spray, air coolers, combustible gases, etc.).
C. Grimes mentionrd that Mark I seems to be a closed issue.
C. Anderson emphasized again the need for RES programs associated with the Mark II pool dynamic load program (see chapter Mark 'I Approach / Status),
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NRR confirmed that no independent, Mark III related research should be planned, unless changes are made in the NRR assessment of the Mark III issues and data base.
D. Norris emphasized his plans to accomplish PELE-IC by the end of FY 80.
Discussion:
S. Fabic opened the meeting with a short comment to the assignment of R. Cudlin to the TMI accident related task force.
Fabic emphasized that the subject of the meeting will be steam chugging phenomena in pressure-suppression containments, focusing on specific prograrmiatic recommendations.
/
Mark I Approach / Status:
Chris Grimes provided an overview of the Mark I load programs (see Handout #1 in ).
The condensation loads for the Mark I containment design are being derived from test data obtained in the Full-Scale Tesi Facility (FSTF). The FSTF is an integral part of the Mark I Long Term Program, representing a single bay of the Monticello plant with four pairs of downcomers. The loading conditions being derived are (1) condensation oscillation shell loads, (2) pre and post-chug shell
'ds, (3) downcomer lateral loads,(4) vent system pressure oscillations, and (5) source functions for submerged structure drag loads. Ten test series have been performed covering design basis, intermediate break, and small break accidents with both liquid and steam blowdowns.
The Mark I condensation oscillation and chugging shell load data have been used to develop equivalent " rigid wall" shell loads for use in plant-unique analyses.
The " rigid wall" load is obtained by inferring a source in a NASTRAN coupled consistent-mass-matrix fluid and structural model. The source function is varied until the coefficients of a Fourier expansion match those obtained from a select group of data.
The resultant loading function is expressed as an amplitude-frequency histogram. An additional correction factor is applied to the condensation shell loads, which were found to be more significant than the chugging loads, to account for variation in both local and global pool area to vent area ratios.
The Mark I downcomer lateral load functions have been derived from test data as a Resultant Equivalent Static Load (RESL) to be applied at the tip of the downcomer.
Four bending strain gauges located on the upper part of the FTSF downcomers were calibrated to known RESLs. The calibration data can then be used to develop " load-reversal" histograms as functions of angular position around downcomer circumference.
A " reversal" is equivalent to a load cycle on the downcomers. Both the load magnitudes and number of revere are then scaled to plant-unique conditions by the ratio of the downcomer dynamic load factors calculated for FTSF and for the plant. The modified histogram is used in a standard fatigue analysis. Multiple-downcomer loading conditions are based on a probablistic approach.
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. Both the FSTF data and the Mark I condensation load definition techniques are currently under review by tM 00R staff and their consultants. A meeting with the Mark I Owner's Group to discuss this material was scheduled for June 21, 1979.
Mark II Approach / Status:
Cliff Anderson provided an overview of the Mark II steam programs (see Handout #2 in Attachment 3). This included a description of the load specifications and the supporting basis for these loads in the Mark II Lead Plants and Long Term Programs.
The steam loads discussed consisted of the localized lateral loads on the vents, the submerged boundary condensation oscillation (CO) and chugging loads, and the submerged structure loads.
The Mark II Lead Plant Program utilized a boundary load approach for each of the loads resulting from the steam chugging / condensation oscillation phenomena. This approach was necessary to expedite licensing of the Lead Mark II plants. The approach recognized conservatisms in the experiments.
The Lead Plant loads were derived primarily from the 4T and GKM I tests. The conservative nature at the Lead Plant loads is to be confirmed by the Mark II Long Term Program.
The Mark II Long Term Program includes a number of experimental and analytical programs directed at a better understanding of steam chugging / condensation phenomena.
These include the extended 4T tests, the Susquehanna-GKM II tests, the multivent CREARE tests, the Bechtel and Burns and Roe improved chugging /C0 load specification, the multivent hydrodynamic model and the dynamic lateral load model. The status and schedule for these tests was discussed. The programs are scheduled for completion mid 1980.
The discussion indicated needs for research programs to support NRR review efforts associated with the Mark II pool dynamic loads program. RES is establishing an active interface with the GKSS and the JAERI full scale multivent steam testing effort, to expedite information exchange between these organizations and the NRC.
In addition the RES sponsored development of the PELE-IC code at LLL is nearing completion. NRR recommended extended checkout of that code utilizing further problems representative of pressure suppression systems.
Condensation Rate for Chugging:
Professor Sonin provided a brief review of the status of the MIT study on chugging (see Handout #3 in Attachment 3).
The purposes of this study are (1) to understand the physical mechanism of chugging, (2) tv quantify condensation (heat transfer) rates and (3) to postulate a simplified model for chugging. To reach these goals the following approach is underway:
(a) Single-chug experiments in a special device to address (1) and (2),
(b) development of a tentative model, including postulated condensation rate equation and (c) simulation of " chugs" in a small L3MO
. flew visualization system to study mixing effects in the pool.
Professor Sonin discussed the single-chug small scale experiments conducted with low mass flow rates. He stated that in this case the mechanism of chugging is controlled by cutting off bubbles from the steam supply at the edge of the vent pipe and allowing for eddy transport of cold water to the steam / water interface. Some movies, carefully shot, gavg a good impression of these processes. The water spray (in this case 5-20 cm,10*C, derived from postcalculations) causes a rapid condensation with 4-14 milliseconds and a pressure drop in the pipe of about 0.1-0.7 bar. Then wetwell water was sucked into the pipe. The question on extrapolability of these observations to other test conditions or facilities is not yet answered.
GESS Multivent Experiments:
G. Mansfeld presented a brief overview of the GKSS test program. The program consists of a series of full-scale steam venting tests to study the phenomena occuring in a quasi Mark II type pressure suppression system following a loss-of-coolant accident (e.g. vent clearing, chugging, etc.). The test program is described in the GKSS report 78/I/15. The main variaMM of the test program are (1) mass flow in the condensation pipe, (2) temperature of the water pool, and (3) back pressure in the wetwell. Tests will start with the 3-pipe test series, perhaps in August / September 1979.
RES is providing technical support in the form of processing, reporting and c"aluation of test data through contract with LLL.
E. McCauley, who is the project leader of this activity at LLL and who has recently visited GKSS, provided a brief review of the status of the program. He focused mainly on the instrumentation and its problems, such as failure of pressure transducers and water level indicators in the wetwell, and insufficient light for the high speed camera during shakedown tes ts. GKSS personnel are trying to remove tFes e short comings. Movies from one of the 3 shakedown tests - one more is planned for June / July 1979 - had shown that the chugging processes in all three pipes seem to occur nearly simultaneously (within a few milliseconds of each other). He also mentioned that the GKSS personnel seems to be well prepared for these tests, and are highly interested in a close cooperative work with the NRC.
1/5-Scale Mark I Tests - Extended Analysis of Data:
E. McCauley presented a summary of an extensive analysis of data from the 1/5-scale MK I BWR pressure suppression system tests.
Primary focus was placed on computing the hydrodynamic vertical load function (HVFL) and determining the associated peak forces and their standard deviations. These results were used to study the sensi-tivity of the peak loads to various major parameters.
In addition, a complete evaluation of the enthalpy flux variation in the vent system was provided for each test.
Finally, pool swell dynamics were quantified for the nominal test and correlated to the observed ringheader strut loads. One of the canclusions is that the 2D torus sector provides a useful test facility for prediction of peak down-loads, but not for predictions of peak up-loads. The latter were found to be somewhat larger in the 90* torus segment, indicating signifi: ant 3-D effects.
t1S240
. PELE-IC Code Status:
D. Norris stated that LLL plans the following tasks for FY 80:
1)
PELE-IC will be fully documented to reflect code changes and new features mandated by analytical comparisons with nonproprietary test data, and released for public use.
- 2) Additional BWR suppression pool dynamic calculations will be carriec out, per NRC requests in support of the ongoing test programs. Cases to be run will be chosen to enhance code verification and to provide licensing audit assistance.
The LLL work proposal has not yet been reviewed by NRC.
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ATTACHMENT 1 Containment Code Review Group Meeting Attendance S. Fabic, NRC/RES N. Zuber, hdC/RES G. Mansfeld,fiRC/(GRS)
C. Grimes, NRC/NRR F. Chiang, NRC/NRR J. Kudrick, NRC/NRR C. Anderson, NRC/NRR W. Butler, NRC/NRR A. Sonin, MIT D. Norris, LLL E. McCauley, LLL C. Landram, LLL J. Lehner, BNL H. Townsend, GE B. Patel, CREARE J. Block, CREARE J. Sursock, EPRI T. Martin, NUTECH V. Dhir, UCLA O.$E2'lC
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n,., c 5 1979 To Those On The Attached List Gentlemen:
The next meeting of the Containment Code Review Group is scheduled for June 19, 1979, to be held in the lith Floor Conference Room, Willste Bldg. (Silver Spring), starting at 9:00 a.m.
The subject of the meeting will be steam chugging phenomena in pressure-suppression con-tainments. Again the focus will be on specific programatic recommendations.
Hope you can make it.
Agenda Introduction R. Cudlin, NRC/RES Mark I approach / status C. Grimes, NRC/ DOR Mark II approach / status C. Anderson, NRC/ DSS Condensation Rate for Chugging A. Sonin, MIT Foreign Experimental Programs R. Cudlin, NRC/RES Analytical Description of Chugging J. Pitts, LLL Discussion and Recommendations All
- Is load measurement in full scale tests sufficient? (single vent, multiple vent, modeling of containment structures?)
- Do we need analytical descriptions of chugging?
- Can chugging be modeled from first principles?
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To Those On The Attached List - Current / Future programs:
Do we need to do anything differently? Do we need to do more?
Intercompartment Flow Tests n -
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- ), Paulson, NRC J. A. Kudrick, NRC E. Imbro, NRC N. Zuber, NRC C. Grimes, NRC R. Cudlin, NRC C. Anderson, NRC G. Mansfeld, NRC Consultant R. Lahey, RPI A. A. Sonin, MIT I. Catton, UCLA E. McCauley, LLL J. Pitts, LLL D. Norris, LLL
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GENEP,AL FEATURES OF STEAM CONDENSATION AND CHUGGING LOADS I
- ORIGIN OF LOADS IS MOTION OF STEAM-WA'TER INTERFACE AT VENT EXIT.
- DISPLACEMENT EFFECT OF INTERFACE MOTION CREATES PRESSURE TRANSIENTS IN SUPPRESSION P0OL WHICH ARE TRANSMITTED TO SUBMERGED BOUNDARIES.
' BEHAVIOR OF " SOURCE" DEPENDS PRIMARILY ON VENT STEAM FLUX RATE.
i
" HIGH STEAM FLUX - MOTION IS ESSENTIALLY SINUS 0IDAL - AMPLITUDE RELATIVELY CONSTANT
LOW STEAM FLUX - MOTION IS UNSTABLE (STEAM BUBBLE COLLAPSE - CHUGGING)
FREQUENCY OF OCCURENCE AND AMPLITUDE RANDOM BUT BOUNDED.
- CHARACTER OF S0b9CE ALSO SENSITIVE TO AIR CONTENT AND GLOBAL PRESSURE LEVEL; SOME DEPENDENCE ON SUPPRESSION POOL TEMPERATURE.
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tmD Sut%RY Pool BOLNMRY CONDENSATION l.IMDS LOAD OR Pmnamm
_. SPECIFICATION MSIS Him STEM flux biMJS0!ML PRESSURE fmElm LICENSEE,
> 12 ts/SEC/FT 4.4 PSI-fTP 4T, ikVIKEN 2-7 HZ MTA CCNSERVATIVE SmerRIC Loe feeuCATIm CmSEWATIVE llNIF m M BEL W VENTS "sim STEM Fux SINUS 0!mL PRESSWE FCREl m LICENSEES 8-12 ts/SEC/FT 7.5 PSI-FIP 4T,Pkv! KEN 2-7HZ IhTA CmSERVATIVE Sm e mIC Lmn APeu CAT!W Cm SERVATIVE th! FORM BELOW VENTS e
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Loe Stme CamIm LOADS i
Loe m PmNOMEM SPECIFICATION 8 ASIS DU3GING REmESENTATIVE 4T 4T, FcnEIGN LICENSEE, 4 8 LB/SEc/n PRESSURE IPACE NEVIEN UNIFmMBELOWVENTS SY?CmDNIZED CHUGS UNIFORMloGING 4.8 PSI,-4.0 PSI 20-30 HZ ASwemic Laelm
+20 PSI,-24 PSI PERIPWRAL VARIATION OF #FLITlOE MXIMit mX/MINOPPOSED 618268
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OiEllE LMD CmSERVATISS
- DIECT AFPLICATIQi T MXItiN LMDS WND IN A BOL10lfE RLL SCALE SIIELE Eli TE5T FACILITY (4D
- QERVATIVE MTA SELECTED FREFERENTIALLY
- S%LL R)0L NEA RELATIVE TO FT0TOTYPE
- LW AIR CWTBli
- LMDIfE APPLICATIWS R0 VIE NEITIGML DEERVATI91
- EXACT VBfT SYiEHRGilZATim
- FREDLELY CMTBfT m SELECTED FRESSURE SIGMTIRE t%XIMIZES STRETLFAL RESPONSE
- 06ERVATISM DEP0iGTPATED NMLYTICALLY 616260,
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MARK 11 OWNERS GROUP SPECIFICATION FOR CHUGGING LOADS ON SUBMERGED BOUNDARY j
- TEMPORAL VARIATION 9
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MARK II OWflERS GROUP SPECIFICATION FOR CHUGGING LOADS ON SUBMERGED BOUNDARY
' SPATIAL VARIATION M ARK 61 PLAN VIEW 27a*
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CROSS SECTION V V a
so A. ASYMMETRIC LOADtP*G CONDITION B.UNtFORM LOAOlNG CONotTgN e
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DMG DMG DMG Ft.cw FIELD FROM SOERICAL S0mCE no b 0F ImEs SomCE IIMIm ne Pmstm CmsIDERS WORST CASE WRtABLE SotaCE STRENGE CmSIDER!m NtMER OF PARTICIPATim VENTS SomCE Ih 8 1T1EE FROM II I
PARx 11 La tem Paomm STEAM CMENSATIm6MEGDE B r o e n STlDIES IbemER l.ATERAL [mS
- SIrn.E Verr im IMmIC Lmo it0EL Suscmwem - KWU TESTS SmMERED Bottawu imS
- CmIENSATIm OSCILI.ATIm EXTENDED 4TTESTS SuScmwta - KWU TESTS
- CHUMING liLTIVENT STW!ES CEAE, JfERI 'AND 6(S3 IESTS fiLTIVENT fhTRODmHIC lt0EL IwROVED SotRCE SPECIFICATIm STWIES GENERICBEmTELSTTY WPSS-2 BENDSIM STTY StacR&D STRtCREE STEM l.mDS fiLTIVENT fhfDROWPMIC U.TEL 616273
CEAE TEST FEGM" QUECT!WS
- ESTABUSH LMD IR90 WIm NtreER OFVENTS
- CmFIRM Mi ASS &eTroNS
- VERIFY Puwr LMD AH.ICATim MmODS PRO @AM EteerrS
- SCALING ANALYSIS AND SCOPING IEST (Pf%SE1)
- MLTIVENT IESTS (OMSE 2)
- APPUCATIm OF RESU.TS (h%SE 3) g.
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SCOPE OF CEAE TESTS CCPEENSATION PAPPING IESTS (CQMP)
- V16 SCAUE, SINGLE VENT
- FLOW VIStALIZATION
- VERIFY $ SCOPING TEST M TRIX
- PNWETRIC EFFECTS SINGLE VDU IESTS
- V10, V6, V4 SCALE
- Flu VENT UMN
- EFFECTS OF STEAM M SS FU M POOL TEWERATlRE STENi AIR CCfRENT PRESSLRE GEOFETRY
-SCALINGSTLDIES MULTIVENTIESTS SCALE VDUS V10 L 3, 7,19 V6 1, 3, 7 V4 L3 9 12 1
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CEAE TESTS PRELIMINARY 63SONATICNS SCAUNG STLDIES lb SIHti E SOEN ADEOMTE FRowe SCALING Pcot SWELL - BmBLE bRCWN DdMICS 50iSCALING D3LE COLMPSE, Ven &m NtreER SEMI - D PIRICAL SCHE N COEENSATION IDENTIFY KEY PHDDBM FOR ACCURATE SCAUNG TESTS MTRIX COVER VARIOUS SCALING SCHET S hl.TIVDE IESTS N ttLTIPLIER ESS TIM ONE N MLTIPLIER IECREASES WITH NO. VDUS
,% sing INFOR?%TIO4 k TIPLE CH.E STATISTICS Tue Wim STATISTICS
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STATUSOF CWl E TESTS PHASEI SCALING $fMLYS!S, SIfRE VDE IESTS, 1/10, 1/6 h TivENT TESTS (Caetat JLNE 1979)
Pr%SE II EXTENDED hTIVENT IESTS 1/10,1/6, 1/4, 5/12 SCALE (DECISIm 20~1979) fE ftETING Pfwse I RESLLTS PHASE II /WD III PtmS (Ju.Y17,18,1979)
PsASEIII APPLICATimSIITFDDS PREUMIPMRY MSED m P>wSE I 2 0 1979)
Firat IhSED m h%SE II C0 HO)
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% K II FU_L SCALE 4TC/0 TESTS TEST QLJECTIVE
- C04 FIRM CtRRENT M K ll C/0 SPEC.
- AmRESS VENT LENGE EFFECTS
- REFINE C/0 SPECIFICATI04 TEST SCKIX.LE
- FACILITY IDDIFICATIO4S
,10 1980
-TESTING 20 1980
- REPORT 401980
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JAERI Ftu SCALE MutTiven TESTS TEST blJEENTS 245MEASlJDOUS PRESSLRE aP TEWERATWE MTERlEVEL STPAIN DISPLK D E U IwAcTlmoS TEST SCEDlLE 5 YEAR IEST PROGRAM - START 1977 BEGIN IESTING $PRIL 1979
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a Ik II h w_ m CAL PROGRu s Ih TIWNT HYDRODYtMIC IbDEL
- LIBRARY OF 4T CHUGS CIO
- IbtrE CARLO SEtscrim CHUG NtrwR PHASESHIFT
- HYDRODYtMIC IbDEL PererrIAL PLN IETHOD OF IP%GES CHUGGINGIWROYEKNrPROGR#G (GENERICBECHTELIEBOD)
(WPSS-2BEDROSIANIEm0D) 4T STwlES 4TNUKRICALIDEL CHW SOPCE DEVEUMerT b K li APPLICATION N'
P a n d ou4 [' I l i chugging MI T~ study on ~ v i j i A. to understard physical rnechanism l Purposes l f chugging .f B. to qu.a niify' condensakon (heat fransfer) rwie, -/o' r av. hi-/4 hl semi-empirical cormlakon which implies scalig. C. +o poslalale modal .fer chuging, insofar as -thaf-is possi6le %bhve. modal, inc/uding posta - Approac4 /. -lafed cona'ansar4bn rale Quabbn. bwaichuk z Sonin NueEG/ce-c22/ R, Sing /e-chug aperimen/s in special ciavice., +o adass A z B above. 3. Birnalaled' ' chugs "ih small . flow visuahzakon sys k Jo in pool [qualikne.). fecls slud snixi e y I (;,$fk?E7 p reaesea by 4.,s%,. rt4 er) cs n. l e C'om1etinnent Revick Q< cup Mech mom J'~e I e l9'1't r
SiMGLE-CHUG GXPER IM ENT i I I?cservoir 7 s p sig, Steam "PPN O Ao esig e w-L_, gwer-l T 4odam t m 4ra p ( = 4i -for cbririg p f l 1Sc til ' ' /._ WATEC 46 VEL i m samme m a== w
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d= 10 cm 7y~ pica L couomous : 6h&,., ~ S k /m's g 7 g,. e /C C ii TYP/ CAL HEA SUREHe% : Ei:s ~ Waler-desc u b s-lage : merf pras.sure ~ / han l wake veloci/y ~ l m/s . Chug {deps.ssar;2 den) vanf ressurec/ rop ~ 0./-0.7 bar p durahon af drop ~ 4-14 ms Wahr asced s-lage : wahr velociG ~ 3-7 m/s QALCWA770.US FMH MEASuREHEA!T3 Condensa/ior, heaf .f4' a du' ring chug (c/apssurizde}: j ~ (2 - /3 5)x /Q Wlm* o.3 9 62. Q/m*6 AmounV of co/d (fc) wader re7utra/ olo ea l ohservai chug preseuca dep ~ 5-20 cm' 61.E2C em. k. .. -.. -~
vent de. /0 cm = ~ water daacut ve/cc;G ~ / m/s sleam pressure i,, verd ~ / bar-05 - double-chug cases ia,cluded - s;"8 e. chu3 cases onJl l r - -p N8 ^ y g e t k.) t q 8: $o= Ae 8 o o E 10 x !O' W/m* o j, heaf ; flux dung cendensa/hn 05
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6 i -dermal f/ux E! @4 Ms [ =:- 1 4 rr }li kb
- 77 S
== eb 2 x /O ~J/m*.s. ~ s bDS EO U [O /99 V) c w (v;- 7;-) ~ 3-e no' a7/,,,'s. fa w i S x /O' J/ms. ~ ~ ~ j ~ $u., L> tw. >e,,, 6 I ...... a..
-.--)...... .-....--....-- L...._..__ t i i I l bwaIch2k.z So<>in ps/ulale i l.l q = St fa u- (s-c) c si i "I { l l St to~' ? ~ e E&arimadal made4 - "l
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Sie- ~ = f,Pu u'(7i-Ta 3.gxtdw/m' 0 /3 ~ but pslula.kd' -lime wban his -farned on " clea</g incorred in xx s model. is b.183$IO ( 9}}