Friction factor effect and heat transfer enhancement in combined dimple geometry arrange in different angle to flow direction

One of the most effective passive techniques for heat transfer enhancement in heat exchanger devices is the surface roughness flow augmentation model. In this study, the surface pressure and heat transfer are measured using experimental and computational methods in a rectangular channel. Three aspec...

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Autores principales:	S.A. Aasa, A.S. Shote, S.O. Giwa, M. Sharifpur
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2022
Materias:	Angled compound dimple Aspect ratio Friction factor Heat transfer enhancement Passive technique and Nusselt number Fuel TP315-360
Acceso en línea:	https://doaj.org/article/9c8c927196d4432b8109d3e8420778aa
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id	oai:doaj.org-article:9c8c927196d4432b8109d3e8420778aa
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spelling	oai:doaj.org-article:9c8c927196d4432b8109d3e8420778aa2021-11-28T04:38:18ZFriction factor effect and heat transfer enhancement in combined dimple geometry arrange in different angle to flow direction2666-052010.1016/j.jfueco.2021.100043https://doaj.org/article/9c8c927196d4432b8109d3e8420778aa2022-03-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666052021000364https://doaj.org/toc/2666-0520One of the most effective passive techniques for heat transfer enhancement in heat exchanger devices is the surface roughness flow augmentation model. In this study, the surface pressure and heat transfer are measured using experimental and computational methods in a rectangular channel. Three aspect ratios, AR, 0.05, 0.035, and 0.025, dimple channel with pitch to depth ratios, P/δ = 6 are tested in this study. The angled dimple surface comprises of two cases; case 1 0 °Circular - 45°Oval dimple (0 °C – 45°O) and Case2 45° Oval - 0° Circular dimple (45° O – 0 °C). The computational study is conducted for Reynolds number, Re 600–11000. The data from the compound-dimple channel is normalized with the smooth channel data of heat transfer and friction factor parameters. It is revealed that friction factors, f, friction factors ratio, f/fo, average Nusselt number, Nuavg, Nusselt number ratios, Nu/Nuo, are dependent on Re. The performance index on the compound dimple surface using the ratio of Nusselt numbers, Nu/Nuo, to friction factors, f/fo. The arrangement and location of the dimple have momentous consequences for the pressure drop parameters f and f/fo. The surface pressure and temperature show that the flow is uniformly distributed in the channel. The performance index improves and Re has strong influence on it. The compound dimple geometry does indicate a strong model for application in heat exchanger devices. Optimum performance of 49% for case 1 and 23% for case 2 are observed.S.A. AasaA.S. ShoteS.O. GiwaM. SharifpurElsevierarticleAngled compound dimpleAspect ratioFriction factorHeat transfer enhancementPassive technique and Nusselt numberFuelTP315-360ENFuel Communications, Vol 10, Iss , Pp 100043- (2022)
institution	DOAJ
collection	DOAJ
language	EN
topic	Angled compound dimple Aspect ratio Friction factor Heat transfer enhancement Passive technique and Nusselt number Fuel TP315-360
spellingShingle	Angled compound dimple Aspect ratio Friction factor Heat transfer enhancement Passive technique and Nusselt number Fuel TP315-360 S.A. Aasa A.S. Shote S.O. Giwa M. Sharifpur Friction factor effect and heat transfer enhancement in combined dimple geometry arrange in different angle to flow direction
description	One of the most effective passive techniques for heat transfer enhancement in heat exchanger devices is the surface roughness flow augmentation model. In this study, the surface pressure and heat transfer are measured using experimental and computational methods in a rectangular channel. Three aspect ratios, AR, 0.05, 0.035, and 0.025, dimple channel with pitch to depth ratios, P/δ = 6 are tested in this study. The angled dimple surface comprises of two cases; case 1 0 °Circular - 45°Oval dimple (0 °C – 45°O) and Case2 45° Oval - 0° Circular dimple (45° O – 0 °C). The computational study is conducted for Reynolds number, Re 600–11000. The data from the compound-dimple channel is normalized with the smooth channel data of heat transfer and friction factor parameters. It is revealed that friction factors, f, friction factors ratio, f/fo, average Nusselt number, Nuavg, Nusselt number ratios, Nu/Nuo, are dependent on Re. The performance index on the compound dimple surface using the ratio of Nusselt numbers, Nu/Nuo, to friction factors, f/fo. The arrangement and location of the dimple have momentous consequences for the pressure drop parameters f and f/fo. The surface pressure and temperature show that the flow is uniformly distributed in the channel. The performance index improves and Re has strong influence on it. The compound dimple geometry does indicate a strong model for application in heat exchanger devices. Optimum performance of 49% for case 1 and 23% for case 2 are observed.
format	article
author	S.A. Aasa A.S. Shote S.O. Giwa M. Sharifpur
author_facet	S.A. Aasa A.S. Shote S.O. Giwa M. Sharifpur
author_sort	S.A. Aasa
title	Friction factor effect and heat transfer enhancement in combined dimple geometry arrange in different angle to flow direction
title_short	Friction factor effect and heat transfer enhancement in combined dimple geometry arrange in different angle to flow direction
title_full	Friction factor effect and heat transfer enhancement in combined dimple geometry arrange in different angle to flow direction
title_fullStr	Friction factor effect and heat transfer enhancement in combined dimple geometry arrange in different angle to flow direction
title_full_unstemmed	Friction factor effect and heat transfer enhancement in combined dimple geometry arrange in different angle to flow direction
title_sort	friction factor effect and heat transfer enhancement in combined dimple geometry arrange in different angle to flow direction
publisher	Elsevier
publishDate	2022
url	https://doaj.org/article/9c8c927196d4432b8109d3e8420778aa
work_keys_str_mv	AT saaasa frictionfactoreffectandheattransferenhancementincombineddimplegeometryarrangeindifferentangletoflowdirection AT asshote frictionfactoreffectandheattransferenhancementincombineddimplegeometryarrangeindifferentangletoflowdirection AT sogiwa frictionfactoreffectandheattransferenhancementincombineddimplegeometryarrangeindifferentangletoflowdirection AT msharifpur frictionfactoreffectandheattransferenhancementincombineddimplegeometryarrangeindifferentangletoflowdirection
_version_	1718408274728976384

Friction factor effect and heat transfer enhancement in combined dimple geometry arrange in different angle to flow direction

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