摘要
Heat transfer characteristics of a small heated device have been investigated in a liquid bath with gas jetimpingement as function of gas flow rate,coolant temperature,liquid phsicochemical properties,heat flux,heat source size,ambient pressure and the distance between jet and heated wall.The experimental results show that the agitation of liquid caused by gas jet bubbles increases greatly therate of heat transfer,and the evaporation of coolant near the wall,which was due to the concentration differencebetween gas-liquid interface and bulk gas phase,gives additional enhancement of heat transfer.The rate ofevaporation related to the bubble growth was mathematically formulated.By using the simultaneous heat and mass transfer model,the convective heat transfer coefficient and masstransfer coefficient can be deduced from the experimental results.In addition,the local heat transfer coefficient and the distribution of evaporation heat flux on the smallheated surface are investigated mathematically and experimentally.
Heat transfer characteristics of a small heated device have been investigated in a liquid bath with gas jet impingement as function of gas flow rate,coolant temperature,liquid phsicochemical properties,heat flux, heat source size,ambient pressure and the distance between jet and heated wall. The experimental results show that the agitation of liquid caused by gas jet bubbles increases greatly the rate of heat transfer,and the evaporation of coolant near the wall,which was due to the concentration difference between gas-liquid interface and bulk gas phase,gives additional enhancement of heat transfer.The rate of evaporation related to the bubble growth was mathematically formulated. By using the simultaneous heat and mass transfer model,the convective heat transfer coefficient and mass transfer coefficient can be deduced from the experimental results. In addition,the local heat transfer coefficient and the distribution of evaporation heat flux on the small heated surface are investigated mathematically and experimentally.
基金
The project supported by National Natural Science Foundation of China.
