Experimental Investigation on Comparison of Local Nusselt Number Using Twin Jet Impingement Mechanism

Mahir Faris Abdullah, Rozli Zulkifli, Zambri Harun, Shahrir Abdullah, Wan Aizon Wan Ghopa, Ashraf Amer Abbas

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Jet impingement is one of the best methods for achieving high heat-transfer coefficient over a flat plate surface. It has been an active research topic for several decades [1]. This study performed experiments on various parameters, such as nozzle-to-nozzle spacing (S/d = 1, 2, and 3 cm) and the distance between the nozzle and the aluminum plate (H/d = 1, 6, and 11 cm), to determine the effect of different Reynolds (Re) numbers using the twin jet impingement mechanism on the local heat transfer of an impinged flat aluminum plate. The same setup was used to measure the heat flux of the jet impinging on a flat aluminum plate surface. The heat flux of the heated air jet impinging on the plate was measured using a heat flux micro-sensor at radial positions 0-14 cm away from the stagnation point. The measurement of the heat flux was used to calculate the local heat-transfer coefficient and local Nusselt (Nu) number for steady air jet and air jet impingement. The Re used were 17,000, 13,000. Results show that the local Nu number was calculated at all measurement points. Furthermore, the Nu number increases with the Re number in the steady jet. The relationship between the results shows that higher flow velocity results in the higher localized heat flux of the steadily heated air jet impinging on the aluminum plate. In addition, the best heat-transfer coefficient in the area near the nozzles and aluminum plate and the nearest distance between the nozzles, especially in the first five points at the plate, decrease away from the center of the aluminum plate for all Re numbers used. Thermal data were collected by Graphtec GL820 multichannel data logger and Fluke Ti25 to capture the temperature distribution in front of the aluminum foil.

Original languageEnglish
Pages (from-to)60-75
Number of pages16
JournalInternational Journal of Mechanical and Mechatronics Engineering
Volume17
Issue number4
Publication statusPublished - 2017

Fingerprint

Nusselt number
Heat flux
Nozzles
Aluminum
Heat transfer coefficients
Reynolds number
Air
Aluminum foil
Flow velocity
Temperature distribution
Heat transfer
Sensors

Keywords

  • Enhancement heat transfer
  • Heat flux
  • Nusselt number
  • Reynolds number
  • Stagnation point
  • Twin jet impingement

ASJC Scopus subject areas

  • Engineering(all)

Cite this

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title = "Experimental Investigation on Comparison of Local Nusselt Number Using Twin Jet Impingement Mechanism",
abstract = "Jet impingement is one of the best methods for achieving high heat-transfer coefficient over a flat plate surface. It has been an active research topic for several decades [1]. This study performed experiments on various parameters, such as nozzle-to-nozzle spacing (S/d = 1, 2, and 3 cm) and the distance between the nozzle and the aluminum plate (H/d = 1, 6, and 11 cm), to determine the effect of different Reynolds (Re) numbers using the twin jet impingement mechanism on the local heat transfer of an impinged flat aluminum plate. The same setup was used to measure the heat flux of the jet impinging on a flat aluminum plate surface. The heat flux of the heated air jet impinging on the plate was measured using a heat flux micro-sensor at radial positions 0-14 cm away from the stagnation point. The measurement of the heat flux was used to calculate the local heat-transfer coefficient and local Nusselt (Nu) number for steady air jet and air jet impingement. The Re used were 17,000, 13,000. Results show that the local Nu number was calculated at all measurement points. Furthermore, the Nu number increases with the Re number in the steady jet. The relationship between the results shows that higher flow velocity results in the higher localized heat flux of the steadily heated air jet impinging on the aluminum plate. In addition, the best heat-transfer coefficient in the area near the nozzles and aluminum plate and the nearest distance between the nozzles, especially in the first five points at the plate, decrease away from the center of the aluminum plate for all Re numbers used. Thermal data were collected by Graphtec GL820 multichannel data logger and Fluke Ti25 to capture the temperature distribution in front of the aluminum foil.",
keywords = "Enhancement heat transfer, Heat flux, Nusselt number, Reynolds number, Stagnation point, Twin jet impingement",
author = "Abdullah, {Mahir Faris} and Rozli Zulkifli and Zambri Harun and Shahrir Abdullah and {Wan Ghopa}, {Wan Aizon} and Abbas, {Ashraf Amer}",
year = "2017",
language = "English",
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T1 - Experimental Investigation on Comparison of Local Nusselt Number Using Twin Jet Impingement Mechanism

AU - Abdullah, Mahir Faris

AU - Zulkifli, Rozli

AU - Harun, Zambri

AU - Abdullah, Shahrir

AU - Wan Ghopa, Wan Aizon

AU - Abbas, Ashraf Amer

PY - 2017

Y1 - 2017

N2 - Jet impingement is one of the best methods for achieving high heat-transfer coefficient over a flat plate surface. It has been an active research topic for several decades [1]. This study performed experiments on various parameters, such as nozzle-to-nozzle spacing (S/d = 1, 2, and 3 cm) and the distance between the nozzle and the aluminum plate (H/d = 1, 6, and 11 cm), to determine the effect of different Reynolds (Re) numbers using the twin jet impingement mechanism on the local heat transfer of an impinged flat aluminum plate. The same setup was used to measure the heat flux of the jet impinging on a flat aluminum plate surface. The heat flux of the heated air jet impinging on the plate was measured using a heat flux micro-sensor at radial positions 0-14 cm away from the stagnation point. The measurement of the heat flux was used to calculate the local heat-transfer coefficient and local Nusselt (Nu) number for steady air jet and air jet impingement. The Re used were 17,000, 13,000. Results show that the local Nu number was calculated at all measurement points. Furthermore, the Nu number increases with the Re number in the steady jet. The relationship between the results shows that higher flow velocity results in the higher localized heat flux of the steadily heated air jet impinging on the aluminum plate. In addition, the best heat-transfer coefficient in the area near the nozzles and aluminum plate and the nearest distance between the nozzles, especially in the first five points at the plate, decrease away from the center of the aluminum plate for all Re numbers used. Thermal data were collected by Graphtec GL820 multichannel data logger and Fluke Ti25 to capture the temperature distribution in front of the aluminum foil.

AB - Jet impingement is one of the best methods for achieving high heat-transfer coefficient over a flat plate surface. It has been an active research topic for several decades [1]. This study performed experiments on various parameters, such as nozzle-to-nozzle spacing (S/d = 1, 2, and 3 cm) and the distance between the nozzle and the aluminum plate (H/d = 1, 6, and 11 cm), to determine the effect of different Reynolds (Re) numbers using the twin jet impingement mechanism on the local heat transfer of an impinged flat aluminum plate. The same setup was used to measure the heat flux of the jet impinging on a flat aluminum plate surface. The heat flux of the heated air jet impinging on the plate was measured using a heat flux micro-sensor at radial positions 0-14 cm away from the stagnation point. The measurement of the heat flux was used to calculate the local heat-transfer coefficient and local Nusselt (Nu) number for steady air jet and air jet impingement. The Re used were 17,000, 13,000. Results show that the local Nu number was calculated at all measurement points. Furthermore, the Nu number increases with the Re number in the steady jet. The relationship between the results shows that higher flow velocity results in the higher localized heat flux of the steadily heated air jet impinging on the aluminum plate. In addition, the best heat-transfer coefficient in the area near the nozzles and aluminum plate and the nearest distance between the nozzles, especially in the first five points at the plate, decrease away from the center of the aluminum plate for all Re numbers used. Thermal data were collected by Graphtec GL820 multichannel data logger and Fluke Ti25 to capture the temperature distribution in front of the aluminum foil.

KW - Enhancement heat transfer

KW - Heat flux

KW - Nusselt number

KW - Reynolds number

KW - Stagnation point

KW - Twin jet impingement

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