核动力工程
覈動力工程
핵동력공정
NUCLEAR POWER ENGINEERING
2010年
1期
33-37
,共5页
超临界压力%CO_2%低雷诺数%对流换热
超臨界壓力%CO_2%低雷諾數%對流換熱
초림계압력%CO_2%저뢰낙수%대류환열
Supercritical pressure%CO_2%Low Reynolds numbers%Convection heat transfer
在低雷诺数条件下(Re_(in)=1970和750),对超临界压力CO_2在垂直圆管(d=2 mm)内向上流动和向下流动时的对流换热进行了实验研究.实验结果表明:当Re_(in)=1970时,在热流密度较高的情况下,在管子的入口处向上流动会出现局部壁面温度峰值和谷值,而在向下流动时未观察到此类似现象;当Re_(in)=750时,向上、向下流动壁面温度的变化趋势和换热规律类似.
在低雷諾數條件下(Re_(in)=1970和750),對超臨界壓力CO_2在垂直圓管(d=2 mm)內嚮上流動和嚮下流動時的對流換熱進行瞭實驗研究.實驗結果錶明:噹Re_(in)=1970時,在熱流密度較高的情況下,在管子的入口處嚮上流動會齣現跼部壁麵溫度峰值和穀值,而在嚮下流動時未觀察到此類似現象;噹Re_(in)=750時,嚮上、嚮下流動壁麵溫度的變化趨勢和換熱規律類似.
재저뢰낙수조건하(Re_(in)=1970화750),대초림계압력CO_2재수직원관(d=2 mm)내향상류동화향하류동시적대류환열진행료실험연구.실험결과표명:당Re_(in)=1970시,재열류밀도교고적정황하,재관자적입구처향상류동회출현국부벽면온도봉치화곡치,이재향하류동시미관찰도차유사현상;당Re_(in)=750시,향상、향하류동벽면온도적변화추세화환열규률유사.
Convection heat transfer during upward flow of CO_2 at supercritical pressures in a vertical circular tube (d=2mm) at low Reynolds numbers ranged from 750 to 1 970 has been experimentally investi-gated. The results show that the local wall temperature decrease was observed in upward flow at low heat fluxes and the local wall temperature peak at high heat fluxes with upward flow for Re=1970 which were not observed. The trend of wall temperature and the regularity of heat transfer are similar for upward and down-ward flows.
