Flow field and heat transfer characteristics in dimple pipe with different shape of dimples

Authors

  • Sajida Lafta Ghashim University of Baghdad

DOI:

https://doi.org/10.31185/ejuow.Vol12.Iss2.515

Keywords:

Dimpled pipe ; heat transfer coefficient ; Pressure drop ; dimple size ; performance factor

Abstract

In this work, a numerical study of a thermal performance of water flow inside a dimpled pipe. The effect of three types of dimples (circular, square and rhombus) studied in the numerical simulation. A commercial program called ANSYS was used to model the flow through a circular pipe .The three-dimensional governing differential equations of mass, momentum, and energy were used together with the (K − ε ) model to evaluate the impact of dimples on a turbulent flow and the velocity field. The study was carried out in the Reynolds number (Re) range (2500–15000). The research results demonstrate that the presence of a dimple on the pipe surface greatly increases the rate of heat transmission and the friction factor compared to a normal smooth pipe. Also, the numerical study demonstrated that the Nusselt number (Nu) in case of circular  dimples  at diameter  (4 , 6 and 8) mm was (22, 28 and 43) % greater than the smooth surface.  It is discovered that the improved pipe with circular dimples have a benefit for increased heat transmission efficiency compared with the square and rhombus dimples. Additionally , circular dimples have the ability to supply the lowest friction factor (f) when compared to other types of dimple. The pipe with circular dimples with D= 4mm , at Reynolds number 2500 provided the largest thermal performance criterion (PEC) value about 1.44.

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Published

2024-04-01

How to Cite

Lafta Ghashim, S. (2024). Flow field and heat transfer characteristics in dimple pipe with different shape of dimples. Wasit Journal of Engineering Sciences, 12(2), 125-136. https://doi.org/10.31185/ejuow.Vol12.Iss2.515