工业安全与环保
工業安全與環保
공업안전여배보
INDUSTRIAL SAFETY AND ENVIRONMENTAL PROTECTION
2014年
8期
5-7,11
,共4页
琚忠云%周涛%盛程%黄彦平%肖泽军
琚忠雲%週濤%盛程%黃彥平%肖澤軍
거충운%주도%성정%황언평%초택군
窄通道%数值模拟%沸腾换热%欠热沸腾起始点
窄通道%數值模擬%沸騰換熱%欠熱沸騰起始點
착통도%수치모의%비등환열%흠열비등기시점
narrow channel%numerical simulation%boiling heat transfer%ONB
利用FLUENT软件模拟了间隙宽度为2,5,10 mm ,长度为100 mm的3种竖直窄通道内的沸腾换热过程。在考虑了重力、表面张力和壁面粗糙度影响的条件下,分析了通道间隙尺寸及入口流速等参数对ONB点、系统进出口压差、出口平均温度以及平均表面换热系数的影响。模拟结果为:对于相同入口流速的窄通道,间隙尺寸小的窄通道出口平均温度、进出口压差以及平均表面换热系数较大,ONB点产生较早。通道入口流速越小,ONB点产生越早;较小的粗糙度有利于窄通道的沸腾换热。
利用FLUENT軟件模擬瞭間隙寬度為2,5,10 mm ,長度為100 mm的3種豎直窄通道內的沸騰換熱過程。在攷慮瞭重力、錶麵張力和壁麵粗糙度影響的條件下,分析瞭通道間隙呎吋及入口流速等參數對ONB點、繫統進齣口壓差、齣口平均溫度以及平均錶麵換熱繫數的影響。模擬結果為:對于相同入口流速的窄通道,間隙呎吋小的窄通道齣口平均溫度、進齣口壓差以及平均錶麵換熱繫數較大,ONB點產生較早。通道入口流速越小,ONB點產生越早;較小的粗糙度有利于窄通道的沸騰換熱。
이용FLUENT연건모의료간극관도위2,5,10 mm ,장도위100 mm적3충수직착통도내적비등환열과정。재고필료중력、표면장력화벽면조조도영향적조건하,분석료통도간극척촌급입구류속등삼수대ONB점、계통진출구압차、출구평균온도이급평균표면환열계수적영향。모의결과위:대우상동입구류속적착통도,간극척촌소적착통도출구평균온도、진출구압차이급평균표면환열계수교대,ONB점산생교조。통도입구류속월소,ONB점산생월조;교소적조조도유리우착통도적비등환열。
Here in the research we discuss the boiling heat transfer in three kinds of vertical narrow channels on fluent ,the length of them is 100 mm while the widths are 2 ,5 mm and 10 mm .In condition that gravity ,surface tension and the rough-ness of the surface have been taken into consideration ,the research simulates boiling process in narrow channels and explores how the width of the channel influences onset of nucleate boiling ,the import and export pressure difference ,average tempera-ture of the outlet and the average surface heat transfer coefficient .It is found that the higher export temperature ,average surface heat transfer coefficient ,the earlier ONB ;the smaller the flow speed at the entrance ,the earlier ONB and a little roughness is in favor of boiling heat transfer .