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Results indicate that  hole position has tremendous influence on heat transfer and pressure drop of the shell side,when whose entrance velocity was 0.1m/s, with different hole position,  pressure drop and Nu could be optimized about 3% and 5%-7%, respectively.
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The results show that the trepanning position is of great influence to the heat transfer and pressure drop in the shell pass. Specifically, when the speed is 0.1m/s at the shell pass entrance, the pressure drop in shell pass can be optimized by approximately 3%, as well as Nu can be optimized by 5%-7%.

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