通道内截面汽泡平均直径是计算两相流相间界面传递方程以及计算汽液相界面浓度的重要参数。综合考虑过冷沸腾工况下汽泡动力学、两相热力学以及汽泡聚合效应; 对通道内汽泡尺寸的影响,提出过冷沸腾通道内截面汽泡平均直径预测模型。将该模型与实验数据进行比较,预测值与实验值偏差12.5%。Bubble mean diameter is a key parameter to calculate the interfacial; transfer equation of two phase flow and interfacial concentration.; Taking into account the effects of both the thermal, hydrodynamic; conditions and bubble coalescence rate on the mean bubble size in the; channel, a model has been developed. The proposed model agreed well with; the experimental data within the averaged relative deviation of 12.5%.福建省自然科学基

张尧立

徐志刚

洪钢

边博深

闫晓

黄彦平

English

Xiamen University Institutional Repository

  Vol.38. No.2 A p r .  2 0 1 7 ? 38 ?  ? 2 ? 2 0 1 7 ? 4 ? ? ? ? ? ? Nuclear Power Engineering  ?????0258-0926(2017)02-0184-05?doi:10.13832/j.jnpe.2017.02.0184   ??????????????????????? ?  ? 1???? 1???? 1???? 1??  ? 2???? 2  1. ??????????????361102?2. ???????????????????????????????610041  ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????±12.5%? ??????????????????????? ??????TL329 ? ? ? ?????????Predictive Study of Bubble Mean Diameter in  Subcooled Flow Boiling  Hong Gang1, Xu Zhigang1, Bian Boshen1, Zhang Yaoli 1, Yan Xiao2, Huang Yanping2  1. School of Energy Research, Xiamen University, Xiamen, Fujian, 361102, China; 2. CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu, 610041, China  Abstract: Bubble mean diameter is a key parameter to calculate the interfacial transfer equation of two phase flow and interfacial concentration. Taking into account the effects of both the thermal, hydrodynamic conditions and bubble coalescence rate on the mean bubble size in the channel, a model has been developed. The proposed model agreed well with the experimental data within the averaged relative deviation of ±12.5%. Key words: Subcooled flow, Bubble coalescence, Bubble departure, Mean diameter   0  ?  ? ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????[1-2]?Unal[3]?Meister[4]?????????????????????????Unal ?????????????????Farajisarir ?????????????????????[2]?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????Zeitoun??????????????????[5]????????????????????????? ?????????????????????????????????????????????????????????????????  ?????2016-12-18??????2017-03-10 ???????????????2016J05137? ??????  ??1981—??????????????????????????????????     185 ?  ???????????????????????? 1  ???? 1.1  ?  ? ??????????????? ?1??????????????????????????? ?2?????????????????????????????????? ?3??????????????? ?4?????????????????????? ?5??????????? ?6?????????????? ?7?????????????????? ???????????????????????????????????????????????????????????????????????????????????????????????????????? 1.2  ?????? ?????? Db,d?????????????[6-7]? s, du, qs bY Y YF F F F F           ?1? ???FY? Y ??????Fs,Y? Y ?????????Fdu,Y? Y??????????Fqs??????Fb?????? ???????????????????? 0YF  ????????????????????????? Db,d? 1.3  ?????? ?????????????????????????? ??????????????????????????? ??????????????????????????????????????????????????????????????????????????????? 1w fw c 0.5nT T xT T H                ?2? 1fc 0.5nu xu H                ?3? ???Tw??????Tf????????Tc????????????x??????????H ??????uf????????uc???????????? n? 7[8]? ????????2????????????????????????????????????????????????????????? Ts???????????Tf >Ts??????????????????????????????????Tf <Ts????????????????????????????????????????????????????????????????????????????????????????????????????????????? ????6???7????????????????????????? rb??????????????  f s d 0S T T s            ?4? ? 1??????????????4???????????? f s b b0( ) 2 sin d 0T T r r          ?5? ???? rb?????? w sbw f,avg( 1)(2 1)4 2 ( 2)nT TH n nrn n T T        ?6? b,max b2D r            ?7? ???Tf,avg??????????Ts??????Tw?? Chen???????[9]?   ? 1  ????? Fig. 1  Bubble in Nearby Wall      ? ? ? ? ?                             Vol.38. No.2. 2017186 1.4  ?????? ?????????????????????????????????????? Db,ave?? Db,d?????????????????? Db,max ???????????????????? Db,ave???? b,max b,db,ave 2D DD          ?8? ??????????????????Db,ave ?????8????????????????????????????????????????????????????????????????????????????????????????????????tcoal????????????????????????tcol??? tcol?? tcoal?????????? tcol?? tcoal????????? ???????????????????????????????????????????? ft                ?9? ???????????m?3?t????f??????m?3·s?1?λ????????????3?????????????????????????? tcoal? tcol?????????? f? λ????? ????????????????????? D32????[10]? 332 2F6i ii iDDAD           ?10? 332π6D              ?11? ???α ??????????AF???????? i?????????? 1.4.1  ??????  ?????????????????????????????????????????????????????1??????????????????????????????????????????????????????[11]? ??????????????????????????????????????????????????????????? ?? Kennard?????[12]????????????????????????????????????????????????????????????? 2 1/3 11/31 b/f k D          ?12? ???k1 ????????????? ??????????Db?????? 1.4.2  ????  ????????????????????????????????????????[13-14]? coalcolexp tt                ?13? (2/3)bcol 1/3( / 2)Dt            ?14? ???tcoal ???????????tcol ?????????? ???14?????????????????? ????????????? tcol??????????? ???????????????????????????????????????????????? 5×10?8~11×10?8 m??[15]??????????????????????Kamp??[16]?? tcoal? 0.53b f colcoalcri( / 2)ln16D hth              ?15? ???hcol?????????????1×10?5 m?hcri ???????????f ????????????? ???12????13?????9??????11????????????? 1/332 coal21/3colb,aveexp18D tkt tD           ?16? ???k2?????????? 1.55? 32 b,ave32ΔD DDt t          ?17? ??? 32D ??????????????? ?? Δt????     187 ?  ???????????????????????? ΔΔ Ztu             ?18? ???u??????ΔZ?????? ZONB???? ZLOC??????????? LOC ONBΔZ Z Z          ?19? ZONB ?? Sato&Matsumura ???[17]?????   satw,ONB w satONB f fg g8Δ T qT T Tk h    ?20? ??? w,ONBΔT ?????????ONB???????Tw????Tsat??????q ? ONB??????kf????????hfg??????g ?????? ,fONB sub,in w,ONBspl4pGDc qZ T Tq h        ?21? sub,in sat f,inT T T    ??? sub,inT ?????????Tfin??????G??????D?????????cp,f?????????hspl????????? 1.5  ??????????????? ???????????????? NVG??????[18]??????????????????? ?NVG??????NVG???????xeq,NVG????????? NVG??????????????? xeq???????????????? x? eqeq eq, NVGeq, NVGeqeq, NVGeq, NVGexp 11 exp 1xx xxxxxx                ?22? ???22???????????? Chexal???[19]?????????????????  2  ???? ???????????????????????????????????????????????[20]???????Zeitoun????????????????? ???????? E??  32 ,exp 32 ,pred32 ,exp100%D DED      ?23? ? 2 ?????????????????????Zeitoun????????????????±29.3%???????????????????????????±12.5%?   ? 2  ????????????????? Fig. 2  Performance of Model for Predicting  Bubble Mean Diameters  3  ?  ? ??????????????????????????????????????????????????????????????????????????????±12.5%????????????????????????????????????????????????????????????????????????????  ????? [1] Abdelmessih A H, Hooper F C, Nangia S. Flow effects on bubble growth and collapse in surface boiling[J]. International. Journal of Heat and Mass Transfer, 1972, 15: 115-125. [2] Bibeau E L, Salcudean M. Void growth in subcooled flow boiling for circular and finned geometries for low values of pressure and velocity[D]. UK: The University of British Columbia, 1993. [3] Unal H C. Maximum Bubble Diameter: Maximum bubble-growth time and bubble growth rate during the subcooled nucleate flow boiling of water up to 17.7 mn/m2[J]. International. Journal of Heat and Mass Transfer, 1976, 19: 643-649. [4] Meister G. Vapour bubble growth and recondensation in subcooled boiling flow[J]. Nuclear Engineering and Design, 1979, 54: 97-114. 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Predictive Study of Bubble Mean Diameter in Subcooled Flow Boiling

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Predictive Study of Bubble Mean Diameter in Subcooled Flow Boiling

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