Experimental study on heat transfer from rectangular fins in combined convection-Reference-Cited by-同舟云学术

Experimental study on heat transfer from rectangular fins in combined convection

Published:2023-11-30 Issue:6 Volume:9 Page:1632-1642
ISSN:2148-7847
Container-title:Journal of Thermal Engineering
language:
Short-container-title:

Author:

BASIRI Mehdi¹^ORCID,GOSHAYESHI Hamid Reza¹^ORCID,CHAER Issa²^ORCID,POURPASHA Hadi³^ORCID,HERIS Saeed Zeinali⁴^ORCID

Affiliation:

1. Department of Mechanical Engineering, Azad University, Mashhad Branch, Mashhad, Iran

2. Centre for Civil and Building Services Engineering, School of the Built Environment and Architecture, London South Bank University, London, SE1 0AA UK

3. Faculty of Chemical and Petroleum Engineering, University of Tabriz, Tabriz, Iran

4. Xi'an University of Science and Technology, No.58, Middle Section of Yanta Road, Xi'an, Shaanxi, China 710054

Abstract

Combined natural and forced convective heat transfer arise in many transport processes in engineering devices and in nature, which is frequently encountered in industrial and technical processes, including electronic devices cooled by fans, heat exchangers placed in a low-ve-locity environment, and solar receivers exposed to winds. In this study, the effects of design parameters have been experimentally investigated for the air-side thermal performance under combined (natural and forced) convection of the rectangular plate heat sinks, and the values of optimum design parameters were sought. Many ideas for improving cooling methods have been proposed, one of which is the heat sink. In this work, the average Nusselt number (Nu) and thermal resistance of a simple base rectangular plate and five vertical rectangular plate heat sinks with different numbers of fins under natural and combined convection were exper-imentally investigated to obtain the maximum average Nu and minimum thermal resistance for various Reynolds numbers (Re) from 2300 to 40000, Rayleigh numbers (Ra) from 1300000 to 13000000, and Richardson numbers (Ri) from 0.4 to 3. Also, in this experiment, fin spacing (P) was varied from 2.8 mm to 14.6 mm and the dimensionless P/H ratio was varied from 0.1 to 0.49. The flow velocity varied in the range of 2 to 8 m/s under combined convection. Based on the effects of Ri and Re, two empirical equations for natural and also for combined con-vection heat transfer were derived to calculate the average Nu. The average deviation for these two equations is about 7%. The outcomes of this research can be beneficial for engineers who work on electronics cooling systems.

Publisher

Journal of Thermal Engineering

Subject

Fluid Flow and Transfer Processes,Energy Engineering and Power Technology,Building and Construction

Reference43 articles.

1. REFERENCES

2. Pourpasha H, Heris SZ, Mohammadpourfard M. The effect of TiO2 doped multi-walled carbon nanotubes synthesis on the thermophysical and heat transfer properties of transformer oil: A comprehensive experimental study. Case Stud Ther Eng 2023;41:102607. [CrossRef]

3. Kargaran M, Goshayeshi HR, Pourpasha H, Chaer I, Heris SZ. An extensive review on the latest developments of using oscillating heat pipe on cooling of photovoltaic thermal system. Ther Sci Eng Prog 2022;1:101489. [CrossRef] Emamifar A, Moghadasi H, Noroozi MJ, Saffari H. Transient analysis of convective-radiative heat transfer through porous fins with temperature-dependent thermal conductivity and internal heat generation. J Therm Eng 2021;8:656-666. [CrossRef]

4. Krishnayatra G, Tokas S, Kumar R, Zunaid M. Parametric study of natural convection showing effects of geometry, number and orientation of fins on a finned tube system: A numerical approach. J Therm Eng 2021;8:268285. [CrossRef]

5. Zolfalizadeh M, Zeinali Heris S, Pourpasha H, Mohammadpourfard M, Meyer JP. Experimental Investigation of the Effect of Graphene/Water Nanofluid on the Heat Transfer of a Shell-and-Tube Heat Exchanger. Int J Energy Res 2023;2023:3477673. [CrossRef]