CFD analysis of double pipe counter flow heat exchanger subjected to varying cold fluid velocity in flat inner pipe

  Vishal Gaurav Rai,  Ashish Muchrikar

In this work a 3 dimensional CFD simulation is performed on counter flow arrangement pipe. The main objective of the work is to simulate a concentric pipe flow with heat transfer characteristics with different cross section of inner pipe to examine the effect of the change in cross section on the Nu number of flow. The work is validated against the existing literature with concentric arrangement. The cross section of inner pipe is changed according to the aspect ratio of existing literature and Re of annulus is increased from 2000 to 11000 to see the effect on inner fluid Nu. The Re of hot fluid is kept constant at 7000 and cold fluid Re is taken as 2000, 5000, 8000 and 11000. No significant change in heat transfer coefficient is observed with respect to change in Re for fixed aspect ratio but it is observed that as we go toward lower aspect ratio heat transfer coefficient increased in significant amount and is maximum by 38.47% at Re of 2000. It is also seen that the change is higher for lower Re of cold fluid which is flowing in annulus. For Nu the trend is not same as heat transfer coefficient for different aspect ratio keeping the Re fixed and found maximum at aspect ratio of 0.72 by 6.27% as compared to the previous case with hot fluid at Re of 7000.

Keywords- Heat transfer, Nusselt number, Aspect ratio, effectiveness, Double pipe, Turbulent flow

Unique Identification Number - IJEDR2104009
Page Number(s) - 37-43
Pubished in - Volume 9 | Issue 4 | October 2021
DOI (Digital Object Identifier) -   
Publisher - IJEDR (ISSN - 2321-9939)

  Vishal Gaurav Rai,  Ashish Muchrikar,   "CFD analysis of double pipe counter flow heat exchanger subjected to varying cold fluid velocity in flat inner pipe", International Journal of Engineering Development and Research (IJEDR), ISSN:2321-9939, Volume.9, Issue 4, pp.37-43, October 2021, Available at :http://www.ijedr.org/papers/IJEDR2104009.pdf