1987
DOI: 10.1115/1.3262148
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Full Coverage Impingement Heat Transfer: Influence of the Number of Holes

Abstract: The choice of hole diameter in impingement cooling requires the number of holes to be specified and design information is provided for this purpose. The correlations for impingement cooling usually take geometry effects into account by using the pitch-to-diameter ratio (X/D) and this is independent of the number of holes and specified purely by the desired pressure loss at a given flow rate. Impingement heat transfer from a square array of holes was studied for a range of coolant flows G from 0.1 to 1.8 kg/sm2… Show more

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Cited by 16 publications
(25 citation statements)
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“…Further work on the influence of X/D on the heat transfer coefficient showed that the Z/D was not of major influence and that a constant impingement gap could be used (2,4). Z/D has an influence on the heat transfer coefficient at values below unity, where there is an increased heat transfer (6)(7)(8), and at large Z/D when there is a decreased heat transfer (1,7). Fig.…”
Section: Resultsmentioning
confidence: 99%
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“…Further work on the influence of X/D on the heat transfer coefficient showed that the Z/D was not of major influence and that a constant impingement gap could be used (2,4). Z/D has an influence on the heat transfer coefficient at values below unity, where there is an increased heat transfer (6)(7)(8), and at large Z/D when there is a decreased heat transfer (1,7). Fig.…”
Section: Resultsmentioning
confidence: 99%
“…7 (6,8). The reduction in heat transfer N u = 1 -0.236 I c = 1 -0.185 ND (7) N uo is only a function of the impingement plate design and hence is independent of Z.…”
Section: Crossflow In the Impingement Gapmentioning
confidence: 99%
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“…This gap size was typical of double skin wall constructions for industrial gas turbine combustor cooling applications. A smaller gap and a larger n would be need for practical turbine blade cooling applications and Andrews et al (1985aAndrews et al ( , 1987a) used a 3mm gap for this purpose. The test wall was electrically heated in the absence of any impingement coolant flow to a temperature of approximately 80 C. The electrical power was switched off and the coolant flow initiated at a preset flowrate and the plate temperature monitored as a function of time.…”
Section: Experimental Techniquesmentioning
confidence: 99%