Journal ArticleDOI
Heat Transfer Characteristics for Jet Array Impingement With Initial Crossflow
TLDR
In this paper, two-dimensional arrays of circular air jets impinging on a heat transfer surface parallel to the jet orifice plate are considered, where the jet flow after impingement is constrained to exit in a single direction along the channel formed by the jet and heat transfer surfaces.Abstract:
Two-dimensional arrays of circular air jets impinging on a heat transfer surface parallel to the jet orifice plate are considered The jet flow, after impingement, is constrained to exit in a single direction along the channel formed by the jet orifice plate and the heat transfer surface In addition to the crossflow which originates from the jets following impingement, an initial crossflow is present which approaches the array through an upstream extension of the channel The temperature of the initial crossflow air may differ from the jet air temperature The configurations considered are intended to model the impingement cooled midchord region of gas turbine airfoils in cases where an initial crossflow is also present Nusselt numbers and dimensionless adiabatic wall temperatures resolved to one streamwise jet hole spacing were experimentally determined for ratios of the initial crossflow rate to the total jet flow rate ranging from zero to unity These are presented and discussed relative to the flow and geometric parametersread more
Citations
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Book ChapterDOI
Jet Impingement Heat Transfer: Physics, Correlations, and Numerical Modeling
Neil Zuckerman,Noam Lior +1 more
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.
Book ChapterDOI
Single-Phase Liquid Jet Impingement Heat Transfer
Brent W. Webb,C. F. Ma +1 more
TL;DR: In this article, the authors summarized the available analytical and experimental work in the area with the objective of correlating the research findings and suggested that there is considerable need for further research in liquid jet array applications, both in submerged and free-surface jet configurations.
Journal ArticleDOI
Optimum jet-to-jet spacing of heat transfer for staggered arrays of impinging air jets
Jung-Yang San,Mao-De Lai +1 more
TL;DR: In this article, the effect of jet-to-jet spacing on the local Nusselt number for confined circular air jets vertically impinging on a flat plate has been investigated, and the existence of the (s/d)opt is attributed to jet interference before impingement and/or formation of jet fountain between two adjacent jets.
Journal ArticleDOI
Detailed heat transfer distributions under an array of orthogonal impinging jets
TL;DR: In this article, a transient liquid crystal technique was used to measure the detailed heat transfer coefficients on the target surface for an array of in-line jets impinging on a target plate with different crossflow orientations.
Journal ArticleDOI
Jet impingement heat transfer on dimpled target surfaces
TL;DR: In this paper, the authors investigated the effect of jet impingement on a target surface with a dimple pattern and found that the presence of dimples on the target surface, in-line or staggered with respect to jet location, produces lower heat transfer coefficients than the non-dimpled target surface.
Related Papers (5)
Heat Transfer by a Square Array of Round Air Jets Impinging Perpendicular to a Flat Surface Including the Effect of Spent Air
D. M. Kercher,Widen Tabakoff +1 more