Asymmetric entrainment effect on the local surface temperature of a flat plate heated by an obliquely impinging two-dimensional jet

Vipat, O.; Feng, Shangsheng; Kim, T; Pradeep, A. M.; Lu, Tian Jian

doi:10.1016/j.ijheatmasstransfer.2009.04.007

Cited by 18 publications

(4 citation statements)

References 14 publications

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“…A similar investigation was conducted by V ipat et al [46] and came to com parable conclusions to th a t of O 'Donovan and M urray [45]. The m aximum heat transfer is seen in figure 2.21 to be displaced from the geometric stagnation point in the uphill direction of the im pingem ent surface as does th e equivalent pressure distribution upon the im pingem ent surface.…”

Section: Figure 220: Schem Atic O F Obliquely Impinging Jet O 'Donosupporting

confidence: 61%

Heat Transfer Characteristics of Swirling Impinging Jets

Brown

Murray

Persoons

et al. 2009

Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C

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Impinging jets are used in a wide number of industrial cooling applications due to their high heat and mass transfer abilities. The current research is concerned with the effect of swirl on the heat transfer characteristics of jet impingement cooling. Two inserts were designed order to generate swirling flow. These two designs, “Swirl Insert A” and “Swirl Insert B”, were tested at various Reynolds numbers, between 8000 and 16000 inclusive, and at H/D = 0.5 and 1. The jet was directed downwards onto a 25μm thick stainless steel foil which was ohmically heated. Images were recorded using a thermal imaging camera focused on the underside of the foil. These images were then analysed using Matlab and the Nusselt number profile was obtained. It was found that, while both swirl inserts establish an improvement in the heat transfer by comparison to that of a jet with no swirl, the “Swirl Insert B” design performed better that the “Swirl Insert A” design for high Reynolds number at H/D = 0.5 and consistently for H/D = 1. It was also discovered that, while both the “No Insert” and “Swirl Insert B” results did not change dramatically with an alteration in H/D, “Swirl Insert A” decreased by ∼10%.

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Section: Figure 220: Schem Atic O F Obliquely Impinging Jet O 'Donosupporting

confidence: 61%

Heat Transfer Characteristics of Swirling Impinging Jets

Brown

Murray

Persoons

et al. 2009

Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C

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“…Momentum boundary layer measurement conducted by Vipat et al [6] shows that the inclination causes the uneven flow distri bution on the uphill and downhill sides on a flat plate subject to the slot jet impingement: a higher momentum on the downhill side than on the uphill side exists. The present boundary layer data measured at the selected lateral locations on a flat plate where the second peak is formed i.e., s/Dj = 2.0 for 0 = Odeg and s/Dj = 3.0 for 0 = 45 deg (Fig.…”

Section: Formation Of the Second Peakmentioning

confidence: 99%

“…where h( a) = TM) -T j (6) Here, q" is the estimated net heat flux (Eq. (1)), kf is the thermal conductivity of air while Ts and Tj are the local surface tempera ture and jet flow temperature at the jet exit z = 0, respectively.…”

Section: Data Reduction Parameters and Measurement Uncer Taintiesmentioning

confidence: 99%

“…Therefore, a multitude of studies on momentum, heat, and mass transfer by im pinging jet flows have been reported, considering hydrodynamic [1][2][3], thermal [4,5] or geometric aspects [6][7][8]. It has been shown that overall and local heat transfer characteristics on a flat plate depend strongly on a stream-wise distance from a jet exit-an im pinging distance, among other parameters [1,[9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Heat Transfer Characteristics of an Inclined Impinging Jet on a Curved Surface in Crossflow

Wang

Yan

et al. 2014

Journal of Heat Transfer

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This study reports on heat transfer characteristics on a curved surface subject to an inclined circular impinging jet whose impinging angle varies from a normal position 9 = 0 deg to 9 = 45 deg at a fixed jet Reynolds number of Rej = 20,000. Three curved surfaces having a diameter ratio (DIDfl of 5.0, 10.0, and infinity (i.e., a flat plate) were selected, each positioned systematically inside and outside the potential core of jet flow where Dt is the circular jet diameter. Present results clarify similar and dissimilar local heat transfer characteristics on a target surface due to the convexity. The role of the potential core is identified to cause the transitional response of the stagnation heat trans fer to the inclination of the circular jet. The inclination and convexity are demonstrated to thicken the boundary layer, reducing the local heat transfer (second peaks) as opposed to the enhanced local heat transfer on a flat plate resulting from the increased local Reynolds number.

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The Impingement Heat Transfer Data of Inclined Jet in Cooling Applications: A Review

Pawar

Patel

2019

J. Therm. Sci.

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Asymmetric entrainment effect on the local surface temperature of a flat plate heated by an obliquely impinging two-dimensional jet

Cited by 18 publications

References 14 publications

Heat Transfer Characteristics of Swirling Impinging Jets

Heat Transfer Characteristics of Swirling Impinging Jets

Heat Transfer Characteristics of an Inclined Impinging Jet on a Curved Surface in Crossflow

The Impingement Heat Transfer Data of Inclined Jet in Cooling Applications: A Review

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