Abstract
This paper investigates the enhanced cooling performance of a hybrid microchannel heat sink, consists of the microchannel, nozzle and pillars, in terms of various hydrothermal characteristic parameters. Geometric and flow variables such as jet inclination angle (30°–90°), Reynolds number (200–600) and nozzle diameter (in increasing/decreasing order) are considered for the analysis. Parameters related to both the first and second laws of thermodynamics are computed numerically using commercial software ANSYS FLUENT. The decreasing nozzle diameter layout provided the lowest value of the maximum wall temperature as well as a moderate hike in the pressure drop with respect to other cases. Similarly, a smaller nozzle angle is more suitable for better cooling than the larger nozzle angles.
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Abbreviations
- A w :
-
Wall surface area (m2)
- C :
-
Specific heat capacity (J/kg-K)
- D :
-
Diameter (m)
- D h :
-
Hydraulic diameter (m)
- H :
-
Height (m)
- h :
-
Heat transfer coefficient (W/m2-K)
- k :
-
Thermal conductivity (W/m−K)
- L :
-
Length (m)
- n :
-
Normal direction (m)
- Nu :
-
Nusselt number
- ΔP :
-
Pressure drop across MCHS (Pa)
- P :
-
Pressure (Pa)
- P P :
-
Pumping power (W)
- \({q^{\prime \prime }}\) :
-
Heat flux (W/cm2)
- R th :
-
Thermal resistance (K/W)
- Re :
-
Reynolds number
- S :
-
Entropy generation (W/K)
- T :
-
Temperature (K)
- u :
-
Velocity in x-direction (m/s)
- V :
-
Velocity (m/s)
- ∀:
-
Volume (m3)
- \({\dot v}\) :
-
Volumetric flow rate (m3/s)
- v :
-
Velocity in y-direction (m/s)
- W :
-
Width (m)
- w :
-
Velocity in z-direction (m/s)
- x :
-
X-coordinate (m)
- y :
-
Y-coordinate (m)
- z :
-
Z-coordinate (m)
- μ :
-
Viscosity (kg/m-s)
- ρ :
-
Density (kg/m3)
- θ :
-
Nozzle inclination angle
- avg :
-
Average
- b :
-
Base
- c :
-
Channel
- f :
-
Fluid
- gh :
-
Thermal
- gf :
-
Frictional
- in :
-
Inlet
- J :
-
Nozzle jet
- max :
-
Maximum
- out :
-
Outlet
- p :
-
Pillar
- s :
-
Solid
- t :
-
Total
- w :
-
Wall
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Acknowledgments
This work was supported by IIITDM Jabalpur, India.
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Jyoti Pandey is a Research Scholar in the Discipline of Mechanical Engineering at IIITDM Jabalpur. She received her B.E. degree from Jabalpur Engineering College, Jabalpur, India in 2015 and M.Tech. degree in Thermal Engineering in 2018 from the National Institute of Technology, Raipur, India. Her research interests include microcombustion, microfluidics and heat transfer.
Mohd. Zahid Ansari is an Associate Professor in the Discipline of Mechanical Engineering at IIITDM Jabalpur. He received his B.Tech. degree from the Aligarh Muslim University, India in 2001, and M.Tech. and Ph.D. degrees in 2006 and 2010 from the Department of Mechanical Engineering, Inha University, South Korea. His areas of interest include MEMS, microfluidics and heat transfer.
Afzal Husain is an Associate Professor in the Mechanical and Industrial Engineering Department at Sultan Qaboos University, Oman. He received B.E. and M.Tech. degrees in Mechanical Engineering from Aligarh Muslim University, India, and earned Ph.D. degree with a major in Thermodynamics and Fluid Mechanics at Inha University, South Korea. He worked as a full-time lecturer in the Department of Mechanical Engineering at Inha University from Mar. 2010 to Aug. 2012. His research interests are thermofluids & computational fluid dynamics (CFD), microfluidics, heat transfer and electronics cooling.
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Pandey, J., Ansari, M.Z. & Husain, A. Performance analysis of hybrid microchannel heat sink for varying nozzle geometry and layout on the basis of first- and second-law of thermodynamics. J Mech Sci Technol 35, 5753–5764 (2021). https://doi.org/10.1007/s12206-021-1144-5
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DOI: https://doi.org/10.1007/s12206-021-1144-5