CFD study of Convective Heat Transfer of Water Flow Through Micro-Pipe with Mixed Constant Wall Temperature and Heat Flux Wall Boundary Conditions

Authors

  • Amjad Ali Pasha Aerospace Engineering Department, King Abdulaziz University, Jeddah-21589, Saudi Arabia
  • Meshal Nuwaym Al-Harbi Department of Mechanical Engineering, King Abdulaziz University, Jeddah-21589, Saudi Arabia
  • Surfarazhussain S. Halkarni Department of Mechanical Engineering, SRM University-AP, Andhra Pradesh-522240, India
  • Nazrul Islam Department of Mechanical Engineering, King Abdulaziz University, Jeddah-21589, Saudi Arabia
  • D. Siva Krishna Reddy Department of Mechanical Engineering, SRM Institute of Science and Technology, Kattankulathur- 603203, Tamil Nadu, India
  • S. Nadaraja Pillai Turbulence and Flow Control Lab, School of Mechanical Engineering, SASTRA Deemed University, Tamil Nadu-613401, India
  • Ufaith Qadiri Department of Mechanical Engineering, Malla Reddy Engineering College, Telangana-500100, India

DOI:

https://doi.org/10.37934/cfdl.13.7.1326

Keywords:

Convective heat-transfer, Laminar flow, Micro-pipe, Nusselt numbe, Pressure drop, Variable fluid properties

Abstract

The dissipation of heat in tiny engineering systems can be achieved with fluid flow through micro pipes. They have the advantage of less volume to large surface ratio convective heat transfer. There are deep-rooted analytical relations for convective heat transfer available for fluid flow through macro size pipes. But differences exist between the convective heat transfer for fluid flow through macro and micro pipes. Therefore, there is a good scope of work in micro convection heat transfer to study the mechanism of fundamental flow physics. There have been studies with either constant heat flux wall boundary conditions or constant wall temperature boundary conditions with constant and variable property flows. In this article, first, the numerical simulations are validated with the experimental data for 2D axisymmetric conventional pipe with pipe diameter of 8 mm is taken with laminar, steady, and single-phase water flows with constant wall heat flux boundary condition of 1 W/cm2. The computed Nusselt number is compared to the experimental results at different Reynolds numbers of 1350, 1600 and 1700. In the next study, three-dimensional micropipe laminar flow is studied numerically using water with an inlet velocity of 3 m/s and pipe diameter of 100 µm. The mixed wall boundary conditions with upper half pipe surface subjecting to constant wall temperature of 313 K and lower half surface subjecting to 100 W/cm2 are used in the simulations. The focus of research would be to consider the effect of temperature-dependent properties like thermal conductivity, viscosity, specific heat, and density (a combined effect we call it as variable properties) on micro-pipe flow characteristics like Nusselt number at mixed wall boundary conditions and compare it with the constant property flows. The conventional pipe showed no significant difference with variable and constant property flows with different Reynolds numbers. On contrary the flow through 3D micropipe shows that the Nusselt number with variable property flows is less as compared to the constant property flows.

Author Biographies

Amjad Ali Pasha, Aerospace Engineering Department, King Abdulaziz University, Jeddah-21589, Saudi Arabia

aapasha@kau.edu.sa

Meshal Nuwaym Al-Harbi, Department of Mechanical Engineering, King Abdulaziz University, Jeddah-21589, Saudi Arabia

malharbi1284@stu.kau.edu.sa

Surfarazhussain S. Halkarni, Department of Mechanical Engineering, SRM University-AP, Andhra Pradesh-522240, India

surfarazhussain.s@srmap.edu.in

Nazrul Islam, Department of Mechanical Engineering, King Abdulaziz University, Jeddah-21589, Saudi Arabia

nabdulhafiz@kau.edu.sa

D. Siva Krishna Reddy, Department of Mechanical Engineering, SRM Institute of Science and Technology, Kattankulathur- 603203, Tamil Nadu, India

sivakriv@srmist.edu.in

S. Nadaraja Pillai, Turbulence and Flow Control Lab, School of Mechanical Engineering, SASTRA Deemed University, Tamil Nadu-613401, India

nadarajapillai@mech.sastra.edu

Ufaith Qadiri, Department of Mechanical Engineering, Malla Reddy Engineering College, Telangana-500100, India

ufaithqadiri@mrec.ac.in

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Published

2021-07-25

How to Cite

Amjad Ali Pasha, Meshal Nuwaym Al-Harbi, Surfarazhussain S. Halkarni, Nazrul Islam, D. Siva Krishna Reddy, S. Nadaraja Pillai, & Ufaith Qadiri. (2021). CFD study of Convective Heat Transfer of Water Flow Through Micro-Pipe with Mixed Constant Wall Temperature and Heat Flux Wall Boundary Conditions. CFD Letters, 13(7), 13–26. https://doi.org/10.37934/cfdl.13.7.1326

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