流体机械
流體機械
류체궤계
FLUID MACHINERY
2015年
3期
17-21,42
,共6页
超临界 CO2%微细管%换热特性%浮升力
超臨界 CO2%微細管%換熱特性%浮升力
초림계 CO2%미세관%환열특성%부승력
supercritical CO2%miniature tube%heat transfer characteristics%buoyancy
考察超临界 CO2微细管内冷却条件下流动和换热的细观信息（管内不同截面湍动能分布，无量纲速度和温度分布以及湍流雷诺数分布等），结果表明：近壁处湍动能的变化对传热有较大影响，微细管内换热关联式需考虑浮升力的影响。对管径 d ＝0．5，0．3，0．1 mm 时，超临界 CO2的换热特性进行计算分析，回归出管径小于0．5 mm 时，超临界 CO2在冷却条件下竖直向上流动和竖直向下流动时的换热关联式，作为对超临界 CO2研究的有效补充。
攷察超臨界 CO2微細管內冷卻條件下流動和換熱的細觀信息（管內不同截麵湍動能分佈，無量綱速度和溫度分佈以及湍流雷諾數分佈等），結果錶明：近壁處湍動能的變化對傳熱有較大影響，微細管內換熱關聯式需攷慮浮升力的影響。對管徑 d ＝0．5，0．3，0．1 mm 時，超臨界 CO2的換熱特性進行計算分析，迴歸齣管徑小于0．5 mm 時，超臨界 CO2在冷卻條件下豎直嚮上流動和豎直嚮下流動時的換熱關聯式，作為對超臨界 CO2研究的有效補充。
고찰초림계 CO2미세관내냉각조건하류동화환열적세관신식（관내불동절면단동능분포，무량강속도화온도분포이급단류뢰낙수분포등），결과표명：근벽처단동능적변화대전열유교대영향，미세관내환열관련식수고필부승력적영향。대관경 d ＝0．5，0．3，0．1 mm 시，초림계 CO2적환열특성진행계산분석，회귀출관경소우0．5 mm 시，초림계 CO2재냉각조건하수직향상류동화수직향하류동시적환열관련식，작위대초림계 CO2연구적유효보충。
Micro information of flow and heat transfer of supercritical carbon dioxide in miniature cooled tubes were investigated including the turbulent kinetic energy distribution in different sections of cooled tube,the dimensionless temperature and velocity distribution and turbulent Reynolds number distribution.The simulated data indicated that turbulence kinetic energy changement near the wall had a great influence on the heat transfer,buoyancy effects should be considered to heat transfer correlations in mini-ature tubes.Heat transfer characteristics of supercritical carbon dioxide in different diameter tubes of 0.5,0.3,0.1 mm were cal-culated and analyzed.Heat transfer correlations in cooled vertical miniature tubes the diameter less than 0.5 mm were obtained, which could be the efficient supplement for existing studies of heat transfer characteristics of supercritical CO2 .
