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Experimental investigation of the reverse heat transfer of R134a flow through non-adiabatic coiled capillary tubes

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Abstract

This research represents an experimental investigation of the metastable flow and re-condensation phenomenon through non-adiabatic lateral helical capillary tubes and suction tube heat exchanger. The results show that mass flux ratio has a vital role: It affects metastable flow and also reverse heat transfer phenomenon through non-adiabatic helical capillary tube. Therefore, by increasing of the mass flux ratio, the rate of heat transfer between them decreases. In contrast to the strong rate condition of heat transfer between them, reverse heat transfer or re-condensation maybe happen. Moreover, experimental results show that for R134 flow with mass flux ratio more than 57.84, metastable flow exists in non-adiabatic capillary tube with 0.9144 mm inner diameter, 30 mm coil diameter, 6.18 m length, 4 mm inner diameter of compressor suction tube.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

    Masoud Zareh & Mohammad Ghorbani Heidari

Authors
  1. Masoud Zareh
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  2. Mohammad Ghorbani Heidari
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Correspondence to Masoud Zareh.

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Recommended by Associate Editor Chang Yong Park

Masoud Zareh is Assistant Professor of Mechanical and Aerospace Engineering Department, Science Research Branch, Islamic Azad University. He received his Ph.D. in mechanical engineering, energy conversion. His research interests include Experimental & Numerical Modeling of the Multi-phase flow, Two- Phase Flow and Heat Transfer, Pulsating &Oscillating Heat Pipes, Computational Fluid Dynamics (CFD), Modeling and Simulation of Transport phenomena in porous media, Experimental and Numerical Simulation of Cooling Tower, specially the Optimization of the HVAC System and also Renewable Energy (Postdoctoral Researcher in University of Manitoba).

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Zareh, M., Heidari, M.G. Experimental investigation of the reverse heat transfer of R134a flow through non-adiabatic coiled capillary tubes. J Mech Sci Technol 30, 3339–3346 (2016). https://doi.org/10.1007/s12206-016-0643-2

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  • DOI: https://doi.org/10.1007/s12206-016-0643-2

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