Journal
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
Volume 31, Issue 1, Pages 134-153Publisher
EMERALD GROUP PUBLISHING LTD
DOI: 10.1108/HFF-01-2020-0014
Keywords
Natural convection; Non-Newtonian fluid; Square cavity; Heat-generating element
Funding
- Russian Science Foundation [17-79-20141]
Ask authors/readers for more resources
This study focuses on the mathematical modeling of passive cooling systems for electronic devices and analyzes the impact of the position of the heat-generating element and the tilt angle of the electronic cabinet on thermal convection of non-Newtonian fluids. By analyzing streamlines, isotherms, and average Nusselt numbers, the study found that better cooling occurs when the cavity is filled with a pseudoplastic fluid and is not inclined.
Purpose This paper aims to study the mathematical modeling of passive cooling systems for electronic devices. Improving heat transfer is facilitated by the correct choice of the working fluid and the geometric configuration of the engineering cavity; therefore, this work is devoted to the analysis of the influence of the position of the heat-generating element and the tilted angle of the electronic cabinet on the thermal convection of a non-Newtonian fluid. Design/methodology/approach The area of interest is a square cavity with two cold vertical walls, while the horizontal boundaries are adiabatic. An element of constant volumetric heat generation is placed on the lower wall of the chamber. The problem is described by Navier-Stokes partial differential equations using dimensionless stream function and vorticity. The numerical solution is based on the developed computational code using the finite difference technique and a uniform rectangular grid. Findings The key conclusions of this work are the results of a detailed analysis of streamlines and isotherms, the average Nusselt number and profiles of the average heater temperature. It was found that more intensive cooling of the heat-generating element occurs when the cavity is filled with a pseudoplastic fluid (n < 1) and not inclined (alpha = 0). The Rayleigh number of Ra = 10(5) and the thermal conductivity ratio of k = 100 are characterized by the most positive effect. Originality/value The originality of the research lies in both the study of thermal convection in a square chamber filled with power-law fluid under the influence of a volumetric heat production element and the analysis of the influence of geometric and thermophysical parameters characterizing the considered process.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available