Experimental Investigation of Pressure Drop Performance of Smooth and Dimpled Single Plate-Fin Heat Exchangers

Passive heat exchangers (HXs) form an inseparable part of the manufacturing industry as they provide high-efficiency cooling at minimal overhead costs. Along with the aspects of high thermal cooling, it is essential to monitor pressure loss while using plate-fin HXs because pressure loss can introdu...

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Autores principales:	Kanishk Rauthan, Ferdinando Guzzomi, Ana Vafadar, Kevin Hayward, Aakash Hurry
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	pressure drop heat exchanger additive manufacturing surface textures dimples drag reduction Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/3db0eaaa3abb4fc0ba2643737c89f6f6
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spelling	oai:doaj.org-article:3db0eaaa3abb4fc0ba2643737c89f6f62021-11-25T18:21:43ZExperimental Investigation of Pressure Drop Performance of Smooth and Dimpled Single Plate-Fin Heat Exchangers10.3390/met111117572075-4701https://doaj.org/article/3db0eaaa3abb4fc0ba2643737c89f6f62021-11-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1757https://doaj.org/toc/2075-4701Passive heat exchangers (HXs) form an inseparable part of the manufacturing industry as they provide high-efficiency cooling at minimal overhead costs. Along with the aspects of high thermal cooling, it is essential to monitor pressure loss while using plate-fin HXs because pressure loss can introduce additional power costs to a system. In this paper, an experimental study was conducted to look at the effects of dimples on the pressure drop characteristics of single plate-fin heat exchangers. To enable this, different configurations of National Advisory Committee for Aeronautics (NACA) fins with smooth surfaces and 2 mm-diameter dimples, 4 mm-diameter dimples and 6 mm-diameter dimples were designed and 3D printed using fused deposition modelling (FDM) of ABS plastic. The depth to diameter ratio for these dimples was kept constant at 0.3 with varied diameters and depths. These were then tested using a subsonic wind tunnel comprised of inlet and outlet pressure taps as well as a hot wire velocimeter. Measurements were taken for pressure differences as well as average velocity. These were then used to calculate friction factor values and to compare the smooth fin to the dimpled fins in relation to their relative pressure drop performance. It was observed that for lower velocities the 4 mm dimples provided minimum pressure drop, with a difference of 58% when compared to smooth fins. At higher velocities, 6 mm dimples increased the pressure drop by approximately 34% when compared to smooth fins. It can also be concluded from the observed data in this study that shallower dimples produce lower pressure drops compared to deeper dimples when the depth to diameter ratio is kept constant. Accordingly, deeper dimples are more effective in providing drag reduction at lower velocities, whereas shallower dimples are more effective for drag reduction at higher velocities.Kanishk RauthanFerdinando GuzzomiAna VafadarKevin HaywardAakash HurryMDPI AGarticlepressure dropheat exchangeradditive manufacturingsurface texturesdimplesdrag reductionMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1757, p 1757 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	pressure drop heat exchanger additive manufacturing surface textures dimples drag reduction Mining engineering. Metallurgy TN1-997
spellingShingle	pressure drop heat exchanger additive manufacturing surface textures dimples drag reduction Mining engineering. Metallurgy TN1-997 Kanishk Rauthan Ferdinando Guzzomi Ana Vafadar Kevin Hayward Aakash Hurry Experimental Investigation of Pressure Drop Performance of Smooth and Dimpled Single Plate-Fin Heat Exchangers
description	Passive heat exchangers (HXs) form an inseparable part of the manufacturing industry as they provide high-efficiency cooling at minimal overhead costs. Along with the aspects of high thermal cooling, it is essential to monitor pressure loss while using plate-fin HXs because pressure loss can introduce additional power costs to a system. In this paper, an experimental study was conducted to look at the effects of dimples on the pressure drop characteristics of single plate-fin heat exchangers. To enable this, different configurations of National Advisory Committee for Aeronautics (NACA) fins with smooth surfaces and 2 mm-diameter dimples, 4 mm-diameter dimples and 6 mm-diameter dimples were designed and 3D printed using fused deposition modelling (FDM) of ABS plastic. The depth to diameter ratio for these dimples was kept constant at 0.3 with varied diameters and depths. These were then tested using a subsonic wind tunnel comprised of inlet and outlet pressure taps as well as a hot wire velocimeter. Measurements were taken for pressure differences as well as average velocity. These were then used to calculate friction factor values and to compare the smooth fin to the dimpled fins in relation to their relative pressure drop performance. It was observed that for lower velocities the 4 mm dimples provided minimum pressure drop, with a difference of 58% when compared to smooth fins. At higher velocities, 6 mm dimples increased the pressure drop by approximately 34% when compared to smooth fins. It can also be concluded from the observed data in this study that shallower dimples produce lower pressure drops compared to deeper dimples when the depth to diameter ratio is kept constant. Accordingly, deeper dimples are more effective in providing drag reduction at lower velocities, whereas shallower dimples are more effective for drag reduction at higher velocities.
format	article
author	Kanishk Rauthan Ferdinando Guzzomi Ana Vafadar Kevin Hayward Aakash Hurry
author_facet	Kanishk Rauthan Ferdinando Guzzomi Ana Vafadar Kevin Hayward Aakash Hurry
author_sort	Kanishk Rauthan
title	Experimental Investigation of Pressure Drop Performance of Smooth and Dimpled Single Plate-Fin Heat Exchangers
title_short	Experimental Investigation of Pressure Drop Performance of Smooth and Dimpled Single Plate-Fin Heat Exchangers
title_full	Experimental Investigation of Pressure Drop Performance of Smooth and Dimpled Single Plate-Fin Heat Exchangers
title_fullStr	Experimental Investigation of Pressure Drop Performance of Smooth and Dimpled Single Plate-Fin Heat Exchangers
title_full_unstemmed	Experimental Investigation of Pressure Drop Performance of Smooth and Dimpled Single Plate-Fin Heat Exchangers
title_sort	experimental investigation of pressure drop performance of smooth and dimpled single plate-fin heat exchangers
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/3db0eaaa3abb4fc0ba2643737c89f6f6
work_keys_str_mv	AT kanishkrauthan experimentalinvestigationofpressuredropperformanceofsmoothanddimpledsingleplatefinheatexchangers AT ferdinandoguzzomi experimentalinvestigationofpressuredropperformanceofsmoothanddimpledsingleplatefinheatexchangers AT anavafadar experimentalinvestigationofpressuredropperformanceofsmoothanddimpledsingleplatefinheatexchangers AT kevinhayward experimentalinvestigationofpressuredropperformanceofsmoothanddimpledsingleplatefinheatexchangers AT aakashhurry experimentalinvestigationofpressuredropperformanceofsmoothanddimpledsingleplatefinheatexchangers
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Experimental Investigation of Pressure Drop Performance of Smooth and Dimpled Single Plate-Fin Heat Exchangers

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