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R.C. Behera

Bio: R.C. Behera is an academic researcher from Indian Institute of Science. The author has contributed to research in topics: Jet (fluid) & Nusselt number. The author has an hindex of 1, co-authored 1 publications receiving 33 citations.

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TL;DR: In this article, the authors present the results of a numerical investigation of the effect of flow pulsations on local, time-averaged Nusselt number of an impinging air jet.
Abstract: The objective of this paper is to present the results of a numerical investigation of the effect of flow pulsations on local, time-averaged Nusselt number of an impinging air jet. The problem was considered to provide inputs to augmenting heat transfer from electronic components. The solution is sought through the FLUENT (Version 6.0) platform. The standard k-epsiv model for turbulence equations and two-layer zonal model in wall function are used in the problem. Pressure-velocity coupling is handled using the SIMPLEC algorithm. The model is first validated against some experimental results available in the literature. A parametric study is carried out to quantify the effect of the pulsating jets. The parameters considered are (1) average jet Reynolds number (5130 < Re < 8560), (2) sine and square wave pulsations, (3) frequencies of pulsations (25 < / <400 Hz), and (4) height of impingement to jet diameter ratios (5 < H/d < 9). In the case of sine wave pulsations, the ratio of root mean square value of the amplitude to the average value (AN) was varied from 18% to 53%. The studies are restricted to a constant wall heat flux condition. Parametric conditions for which enhancement in the time-averaged heat transfer from the surface can be expected are identified.

40 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the effects of the time-mean jet Reynolds number, temperature difference between the jet flow and the impinging surface, nozzle-to-target distance as well as the frequency on heat and mass transfer were examined.

102 citations

Journal ArticleDOI
TL;DR: In this paper, the authors explore the potential effect of unsteady intermittent pulsations on the heat and mass transfer rate of multiple impinging jets, and demonstrate that a significant heat transfer enhancement due to intermittent pulsation over a wide range of conditions is possible.

48 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of frequency and amplitude on the flow characteristics of axisymmetric pulsating jets was investigated, and the characteristics of turbulent/non turbulent interface of a pulsating jet was compared for potential core, transition zone and fully developed zone.

43 citations

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TL;DR: In this paper, the research status of pulsating flow and its enhancement of heat transfer, including different types and their enhancement effects of composite heat transfer technology which is synergized with other heat transfer technologies.

37 citations

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TL;DR: In this article, a numerical study was conducted to seek an optimized arrangement of steady and pulsating impinging multiple submerged slot jets, and a composite design consisting of steady as well as intermittent (on/off) or sinusoidal jets in different combinations of four slot jets was simulated.

33 citations