采用不等径结构自激振荡流热管实现强化传热

针对不等径结构回路型自激振荡流热管,利用电加热板作为热源,通过改变加热板的输入功率以及加热板的位置,对其壁温和热传输特性进行了实验研究,并与等径结构回路型自激振荡流热管在相同的工质及充液率,相同的热管长度及倾角,以及相同的电加热热板位置等条件下的传热特性进行了对比分析.结果表明:不等径结构自激振荡流热管在中、低负荷情况下,可以起到明显的强化传热作用;而当不等径位置在热管的最下面、热源位置在变径区域的下部时强化传热效果最佳.

Enhanced Heat Transfer by Using Self-Exciting Mode Oscillating-Flow Heat Pipes of Non-Uniform Structure

Experiments were performed with a closed-loop self-exciting mode oscillating-flow heat pipe(SEMOHP) of non-uniform structure,whose wall temperature was measured and heat transmission characteristics was investigated by changing input power and position of the electric heating board used as the heat source.The heat transfer characteristics are compared with those of a closed-loop SEMOHP with uniform structure under the same conditions,such as working medium,filling rate,length and slanting angle as well as position of the electric heating board.Results show that,under low or medium heat load,heat transfer can be enhanced by using a SEMOHP.Besides,in case the heating source is located at the heat pipe's bottom below the non-uniform section,an optimal effect of enhanced heat transfer can be obtained.