| Energy & Mechanical Engineering |
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| Study on the heat transfer of cross flow in vertical upward tubes |
| HU Zhi-hua, YANG Yan-hua, ZHOU Fang-de |
| School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200030, China; State Key Laboratory of Multiphase Flow, Xi’an Jiaotong Univeristy, Xi’an 710049, China |
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Abstract A special device was designed to measure temperature difference in this study of heat transfer of water and oil cross flow inside vertical upward tubes. A new heat transfer correlation was obtained for cross flow. The experimental results showed that the dependence of heat transfer on Reynolds is much smaller in a narrow space than that in a wide space. It was found that the heat transfer correlation of cross flow in a narrow space is obviously different from that in a wide space, and that the heat transfer correlation obtained in a wide space may not be applicable to the cross-flow heat transfer in a narrow space. Further, the single-phase heat transfer capability of water cross flow was compared with that of oil cross flow. The experimental results showed that the average heat transfer coefficient of water is about 2~3 times that of oil when they have the same superficial velocity.
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Received: 19 November 2004
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