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Forced convection heat transfer over a plate through multi nozzle

TL;DR: In this article, an experimental study of forced convection heat transfer over flat plate through multi-nozzle, and study of parameters that affect the convective heat transfer was conducted.
Abstract: A nozzle is a mechanical device or orifice designed to control the characteristics of a fluid flow as it exits an enclosed chamber or pipe. This paper is related with an Experimental study of forced convection heat transfer over flat plate through multi-nozzle, and study of parameters that affect the convective heat transfer. An experiment is conducted to study the effect of multi nozzle diameter, heat flux and speed of fan on the forced convection heat transfer in cooling of electronic components. Speed of fan is varied between 1.29 m/s to 4.47 m/s and nozzle diameter 4 mm to 6 mm with chamfer at constant nozzle-to test plate surface spacing. Multi nozzle array is more efficient than the direct fan cooling, because it increases the speed of fluid on heat plate target. Numerical study is done by using CFD and to study flow over plate with micro multi-nozzle zone during forced convection heat transfer by Simulation.
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Journal ArticleDOI
TL;DR: In this article, the authors derived a correlation for the Nusselt number of the form suggested by this evidence using a selection of the data and showed that this exponent should be a function of nozzle-to-plate spacing and of the radial displacement from the stagnation point.

1,030 citations

Book ChapterDOI
TL;DR: In this article, a review of recent impinging jet research publications identified a series of engineering research tasks that are important for improving the design and resulting performance of impinging jets: (1) clearly resolve the physical mechanisms by which multiple peaks occur in the transfer coefficient profiles, and clarify which mechanism(s) dominate in various geometries and Reynolds number regimes.
Abstract: Publisher Summary This chapter presents a discussion on jet impingement heat transfer. The chapter describes the applications and physics of the flow and heat transfer phenomena, available empirical correlations and values they predict, and numerical simulation techniques and results of impinging jet devices for heat transfer. The relative strengths and drawbacks of the Reynolds stress model, algebraic stress models, shear stress transport, and v 2 f turbulence models for impinging jet flow and heat transfer are compared in the chapter. The chapter provides select model equations as well as quantitative assessments of model errors and judgments of model suitability. The review of recent impinging jet research publications identified a series of engineering research tasks that are important for improving the design and resulting performance of impinging jets: (1) clearly resolve the physical mechanisms by which multiple peaks occur in the transfer coefficient profiles, and clarify which mechanism(s) dominate in various geometries and Reynolds number regimes, (2) develop a turbulence model, and associated wall treatment if necessary, that reliably and efficiently provides time-averaged transfer coefficients, (3) develop alternate nozzle and installation geometries that provide higher efficiency, meaning improved Nu profiles at either a set flow or set blower power, and (4) further explore the effects of jet interference in jet array geometries, both experimentally and numerically. This includes improved design of exit pathways for spent flow in array installations.

693 citations

Journal ArticleDOI
TL;DR: In this article, a numerical finite difference approach was used to compute the steady and unsteady flow and heat transfer due to a confined two-dimensional slot jet impinging on an isothermal plate.

172 citations


Additional excerpts

  • ...[3], Lee [4], Goldstein [5], Murthy [6] etc....

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Journal ArticleDOI
TL;DR: In this article, the effects of the diameter of a round turbulent jet impinging on a flat plate surface were investigated for the case of the jet Reynolds number (Re) of 23,000, with a dimensionless distance between the nozzle and plate surface (L/d) ranging from 2 to 14 and a nozzle diameter ranging from 1.36 to 3.40 cm.
Abstract: The effects of nozzle diameter on heat transfer and fluid flow are investigated for a round turbulent jet impinging on a flat plate surface. The flow at the nozzle exit has a fully developed velocity profile. A uniform heat flux boundary is created at the plate surface by using gold film Intrex, and liquid crystals are used to measure the plate surface temperature. The experiments are performed for the jet Reynolds number (Re) of 23,000, with a dimensionless distance between the nozzle and plate surface (L/d) ranging from 2 to 14 and a nozzle diameter (d) ranging from 1.36 to 3.40 cm

129 citations


"Forced convection heat transfer ove..." refers background in this paper

  • ...[3], Lee [4], Goldstein [5], Murthy [6] etc....

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  • ...Several researches (Lai et al. [1], Schroeder et al. [2], Victor et al. [3], Lee [4], Goldstein [5], Murthy [6] etc.), has focused on the heat transfer and fluid mechanics in free impinging jets, primarily in the turbulent regime....

    [...]

  • ...[4] Dae Hee Lee, Jeonghoon Song, Myeong Chan Jo, 2004, ―...

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  • ...In previous studies that deal with study of various parameters Lee et al. [4] and Terzis [7] studied effect of diameter of nozzle/jet and concluded that varying jet diameter in the range of ±10%, has no detrimental effects on the area averaged Nusselt numbers for the target plate and the sidewalls....

    [...]

  • ...[4] and Terzis [7] studied effect of diameter of nozzle/jet and concluded that varying jet diameter in the range of ±10%, has no detrimental effects on the area averaged Nusselt numbers for the target plate and the sidewalls....

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Journal ArticleDOI
TL;DR: This survey, although extensive cannot include every paper; some selection is necessary, is intended to encompass the English language heat transfer papers published in 2003, including some translations of foreign language papers.

106 citations