Numerical Study on Thermal Performance Assessment of a Compact Heat Exchanger Equipped with Two Broken Twisted Strips

Authors

  • Suvanjan Bhattacharyya Assistant Professor, Mechanical Engineering Department, MCKV Institute of Engineering, 243 G. T. Road (N), Liluah Howrah – 711204.
  • Himadri Chattopadhyay
  • Sarbojit Bhattacharjee
  • Niladri Ghosh
  • Soutik Sarkar

Keywords:

Heat transfer enhancement, Friction factor, Broken twisted strip, Swirl flow

Abstract

Twisted strips are a widely used technique for heat transfer enhancement. In the present study, it proposed that two broken twisted strips aiming at achieving good thermohydraulic performance. Effects of the two broken twisted strips (BTS) on the heat transfer, friction factor and thermal performance factor behaviours in a heat exchanger are reported along with smooth duct. The computations are based on the finite volume method with the SIMPLE algorithm implemented. The principle of heat transfer enhancement in the core flow of tube has been proposed to improve the temperature uniformity and heat transfer enhancement in the boundary flow of tube. The studied the temperature profile and velocity profile was obtained by the BTS inserts with different twist ratio (y/W = 1.5, 3.0 and 4.5) and a constant gap ratio (g/W = 1.0). The results have also revealed that the difference between the heat transfer rates obtained from BTS and without BTS. The Nusselt number increases with the increase of Reynolds number. The overall enhancement ratio has been calculated in order to discuss the overall effect of the BTS. This result is useful for the design of solar thermal heaters and air-conditioning duct.

Keywords: Heat transfer enhancement, Friction factor, broken twisted strip, Swirl flow

Cite this Article

Suvanjan Bhattacharyya, Himadri Chattopadhyay, Sarbojit Bhattacharjee et al. Numerical Study on Thermal Performance Assessment of a Compact Heat Exchanger Equipped with Two Broken Twisted Strips, Journal of Refrigeration, Air Conditioning, Heating and Ventilation. 2015; 2(2): 22–30p.


Published

2015-06-21

Issue

Vol. 2 No. 2 (2015)

Section

Articles

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