R32/R134a在水平内螺纹管内流动沸腾强化特性的分析与研究

Convective heat transfer of R32/R134a inside horizontal microfin tubes

Experimental study was reported for flow boiling heat t ransfer of a nonazeotropic mixture of R32/R134a[25%(mass)/75%(mass)]inside bot h smooth and microfin tubes with internal spiral grooves.The influences of mass quality,heat flux & mass flow rate on A f (heat transfer enhanced coef ficient)are discussed, respectively.The experimental results show that the micro fin tubes have distinct performance advantages over the smooth tube at similar c onditions,the varying of heat flux has the greatest effect on A f,and A f varied from 1.4—2.2.

Experimental study was reported for flow boiling heat transfer of a nonazeotropic mixture of R32/R134a [25%(mass)/75%(mass)] inside both smooth and microfin tubes with internal spiral grooves. The influences of mass quality, heat flux and mass flow rate on Af (heat transfer enhanced coefficient) are discussed, respectively. The experimental results show that the microfin tubes have distinct performance advantages over the smooth tube at similar conditions, the varying of heat flux has the greatest effect on Af, and Af varied from 1.4-2.2.