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Heat Transfer Enhancement in Shell-and-Tube Heat Exchangers Using Porous Media

Esmaeili Rad, Sepideh | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43847 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farhanieh, Bijan; Afshin, Hossein
  7. Abstract:
  8. Heat transfer enhancement in heat transfer equipment, such as heat exchangers, has been widely studied. There are plenty of techniques to increase heat transfer in tubular heat exchangers. One of these techniques is applying a porous medium. These media have a great interface with fluids which can enhance the heat transfer rate. Meanwhile, the thermal conductivity of these media is usually greater than that of the studied fluid. Thus, by adding a kind of highly conductive porous insert to a heat exchanger, we are able to save the material used to construct the device and the space occupied by it.
    Shell-and-tube heat exchangers are one of the most widely-used types of exchangers in industries. In this thesis, a 3-D model of a shell-and-tube heat exchanger is considered and porous media are inserted inside its shell and tubes (separately). The effect of porosity and dimensions of these media, on the heat exchanger’s thermal performance and pressure drop is analyzed. Inside the shell, the entire tube bundle is wrapped by the porous medium. While, inside the tubes the porous media are located at the centre of the tubes. Results of modeling this geometry, using FLUENT 6.3 software, shows that this method can improve the heat transfer rate at the expense of higher pressure drop. In order to compare the heat transfer enhancement against the increase in pressure drop, “heat transfer performance ratio” is considered. Analysing this parameter showed that using porous media inside the shell, with particular dimensions and porosities, can increase the heat transfer rate better than pressure drop. While, using porous media inside the tubes do not have such effect and it causes energy loss
  9. Keywords:
  10. Shell and Tube Heat Exchenger ; Porous Media ; Heat Transfer Enhancement ; Increasing Efficiency

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