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Mixed convection heat transfer enhancement through film evaporation in inclined square ducts |
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| Authors: | Jer-Huan Jang Chien-Chang Huang |
| Affiliation: | a Department of Mechanical Engineering, Northern Taiwan Institute of Science and Technology, Pei-To, Taipei, Taiwan 112, PR China b Department of Mechatronic Engineering, Huafan University, Shih Ting, Taipei, Taiwan 223, PR China c Center for Environment Safety and Health Technology Development, Industrial Technology Research Institute, Chu Tung, Hsin Chu, Taiwan 310, PR China |
| Abstract: | The investigation of mixed convection heat transfer enhancement through film evaporation in inclined square ducts has been numerically examined in detail. The main parameters discussed in this work include the inclined angle, the wetted wall temperature and the relative humidity of the moist air mixture. The numerical results of the local friction factor, Nusselt number and Sherwood number are presented for moist air mixture system. Attention was particular paid to the effects of latent heat transport on the heat transfer enhancement. Results show that the latent heat transport with film evaporation augments tremendously the heat transfer rate. The heat transfer rate can be enhanced to be 10 times of that without mass transfer, especially for a system with a lower temperature. Besides, better heat and mass transfer rates related with film evaporation are found for case with a higher wetted wall temperature. The increase in the relative humidity of moist air in the ambient causes the decrease in heat transfer enhancement. |
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