EXPERIMENTAL INVESTIGATION ON HEAT TRANSFER AND PRESSURE DROP OF CONICAL COIL HEAT EXCHANGER WITH PARAMETERS TUBE DIAMETER, FLUID FLOW RATES AND CONE ANGLE

Abstract

The heat transfer and pressure drop analysis of conical coil heat exchanger with various tube diameters, fluid flow rates and cone angles is presented in this paper. Fifteen coils of cone angles 180° (horizontal spiral), 135°, 90°, 45° and 0° (vertical helical) are fabricated and analysed with, same average coil diameter (Dm) and tube length (L) with three different tube diameter (di). The experimentation is carried out with hot and cold water of flow rate 10 to 100 lph (Re range 500 to 5000) and 30 to 90 lph respectively. The temperatures and pressure drop across the heat exchanger are recorded at different mass flow rates of cold and hot fluid. The various parameters (heat transfer coefficient (hi), Nusselt number (Nu) effectiveness (Є) and friction factor (f)) are estimated using the temperature, mass flow rate and pressure drop across the heat exchanger. The analysis indicates that, Nu and f is function of flow rate, tube diameter, cone angle and curvature ratio. Increase in tube side flow rate increases Nu, whereas it reduces with increase in shell side flow rate. Increase in cone angle and tube diameter, reduces Nu. The effects of cone angle, tube diameter and fluid flow rates on heat transfer and pressure drop characteristics are detailed in this paper. The empirical correlations are proposed to bring out the physics of the thermal aspects of the conical coil heat exchangers.

Keywords

Dates

  • Submission Date2014-08-02
  • Revision Date2014-11-28
  • Acceptance Date2014-11-28
  • Online Date2014-12-14

DOI Reference

10.2298/TSCI140802137P

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