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Abstract
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In this work, the heat transfer enhancement of trapezoidal ribs is investigated. Cooling of the three trapezoidal ribs has been achieved with Electrohydrodynamics active method by experimental apparatus. The hydrodynamic and heat transfer behavior of air flow was studied by Electrohydrodynamics active method. The aim of present work is heat transfer enhancement with low pressure loss. In active method, two arrangements of wire electrodes have been applied. The results show that in the same Reynolds numbers and voltages of wire electrodes, the heat transfer was increased in arrangement 1 than arrangement 2. Density of electric charge around of wire electrodes in arrangement 1 is higher than arrangement 2. Therefore, the arrangement 1 is better than arrangement 2. The arrangements 1 and 2 are different with position of wire electrodes. With attention to results the power of corona wind (secondary flow) in low Reynolds flows is higher than in high Reynolds flows, signifying that the corona wind in low Reynolds numbers is better than in high Reynolds numbers. In same Reynolds numbers and voltages of wires, the average performance evaluation criteria was increased in arrangement 2 than arrangement 1.
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