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Evaluation of thermal performance and implementation of prediction tool in a heat exchanger with elliptical leaf strips

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Abstract

In order to enhance thermal efficiency, most process industries are fitted with heat exchangers. Without using external power, we can increase the heat transfer rate by providing different strips in tubes. This paper deals with the passive method of elliptic leaf insertion in a double pipe heat exchanger with opposite orientation and same direction and the heat transfer rate and pressure drop are found. The double elliptical leaf used in experiment has major to minor axes ratios as 2:1 and distance of 50 mm between two leaves are arranged at different angular orientations from 00 to 1800 with 100 intervals. Experimental and numerical simulations are carried and the thermal performance is evaluated at various Reynolds number. Nusselt number increases with increases of Reynolds number and among all elliptical leaf angles, 600 leaf angles gives more heat transfer rate because of high surface area and secondary flows near by the walls of the tube. Friction factor decreases with increased Reynolds number. From the obtained experimental results, a statistical tool generalized regression neural network is considered where the output values are obtained by giving known input parameters without conducting any experimentation.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Sri Sivani College of Engineering, Srikakulam, Andhra Pradesh, India

    J. Bala Bhaskara Rao

  2. Department of Mechanical Engineering, Raghu Engineering College (A), Visakhapatnam, Andhra Pradesh, India

    J. Siddhartha Yadav

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  1. J. Bala Bhaskara Rao
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  2. J. Siddhartha Yadav
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Correspondence to J. Bala Bhaskara Rao.

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Rao, J.B.B., Yadav, J.S. Evaluation of thermal performance and implementation of prediction tool in a heat exchanger with elliptical leaf strips. Heat Mass Transfer 56, 2871–2882 (2020). https://doi.org/10.1007/s00231-020-02903-z

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