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首页> 外文期刊>Journal of enhanced heat transfer >AIR-SIDE HEAT TRANSFER AND PRESSURE DROP FOR ELLIPTICAL TUBES WITH MODIFIED FINS IN A CONFINED CHANNEL
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AIR-SIDE HEAT TRANSFER AND PRESSURE DROP FOR ELLIPTICAL TUBES WITH MODIFIED FINS IN A CONFINED CHANNEL

机译：密闭通道内椭圆形椭圆管的空气侧传热和压降

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摘要

The effect of dimples on fins, fin thickness, and fin height on air-side heat transfer enhancement and pumping power penalty has been evaluated for elliptical tube cross flow heat exchangers. Experiments were conducted using a confined channel without bypass flow at superficial air velocities ranging from approximately 0.6 to 5 m/s. Results of dimpled fins were compared to plain fins of two different heights and thicknesses. Wavy fins were also investigated and compared to plain fins. Conical dimples on thick tall fins enhanced the heat transfer coefficient on the air side with little increase in pressure drop across the tube. For shorter, thinner fins, geometrical modifications such as wavy fins and longer flow path lengths did not increase heat transfer coefficient but led to increased pressure drop.
机译：对于椭圆管横流式换热器，已经评估了凹痕对散热片，散热片厚度和散热片高度对空气侧传热增强和泵浦功率损失的影响。使用无旁通流的密闭通道以约0.6至5 m / s的表观风速进行实验。比较了凹坑鳍的结果与两种不同高度和厚度的鳍鳍的结果。还研究了波浪状鳍片并将其与普通鳍片进行比较。厚的高翅片上的锥形凹痕提高了空气侧的传热系数，而管两端的压降却几乎没有增加。对于较短，较薄的散热片，波浪形的散热片和较长的流路长度等几何形状的变化不会增加传热系数，但会导致压降增加。

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