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Control of Impinging Jet Heat Transfer Using Mesh Screens
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 Title & Authors
Control of Impinging Jet Heat Transfer Using Mesh Screens
Jo, Jeong-Won; Lee, Sang-Jun;
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The local heat transfer of an axisymmetric submerged air jet impinging on a heated flat plate is investigated experimentally with the variation of mesh-screen solidity. The screen installed in front of the nozzle exit modifies the flow structure and local heat transfer characteristics. The mean velocity and turbulence intensity profiles of streamwise velocity component are measured using a hot-wire anemometry. The temperature distribution on the heated flat surface is measured with thermocouples. The smoke-wire flow visualization technique was employed to understand the near-field flow structure qualitatively for different mesh screens. Large-scale toroidal vortices and high turbulence intensity enhance the heat transfer rate in the stagnation region. For a higher solidity, turbulence intensity become higher which increases the local heat transfer at small nozzle-to-plate spacings such as L/D<6. The local and average Nusselt numbers of impinging jet from the (sub)s=0.83 screen at L/D=2 are about 5.6∼7.5% and 7.1% larger than those for the case of no screen, respectively. For the nozzle-to-plate spacings larger than 6, however, the turbulence intensities for all tested screens approach to an asymptotic curve and the mean velocity along the jet centerline decreases monotonically. As the nozzle-to-plat spacing increases for high solidity screens, the heat transfer rate decreases due to the reduction in turbulence intensity and jet momentum.
Impinging Jet;Heat Transfer Control;Solidity Ratio;Turbulence Intensity;
 Cited by
삼각형 멀티 탭을 이용한 충돌제트 열전달 향상 연구,이정욱;이상준;

대한기계학회논문집B, 2004. vol.28. 10, pp.1139-1146 crossref(new window)
Baines, W. D. and Peterson, E. G., 1951, 'An Investigation of Flow Through Screens,' Trans. ASME, Vol. 73, pp.467-480

Rose, W. G., 1970, 'Interaction of Grid Turbulence with a Uniform Mean Shear,' J. Fluid Mech., Vol. 44, pp.767-779 crossref(new window)

Laws, E. M. and Livesey, J. L., 1985, 'Flow Through Screens,' Ann. Rev. Fluid Mech., pp.247-266 crossref(new window)

Johan Groth and Arne V. Johansson, 1988, 'Turbulence Reduction by Screens,' J. Fluid Mech., Vol. 197,pp.139-155 crossref(new window)

Comte-Bellot, G. and Corrsin, S., 1966, 'The Use of a Contraction to Improve The Isotropy of Grid Generated Turbulence,' J. Fluid Mech., Vol. 25, pp.657-682 crossref(new window)

Grant, H. L. and Nisbet, I. C. T., 1957, 'The Inhomogeniety of Grid Turbulence,' J. Fluid Mech., Vol. 2, pp.263-272 crossref(new window)

Kistler, A. L. and Vrebalovich, T., 1966, 'Grid Turbulence at Large Reynolds,' J. Fluid Mech., Vol. 26, pp.37-47 crossref(new window)

Lee, J. and Lee, S. J., 1998, 'Stagnation Region Heat Transfer of a Turbulent Axisymmetric Jet Impingement,' Experimental Heat Transfer, pp.137-155 crossref(new window)

Lee, J. and Lee, S. J., 2000, 'The Effect of Nozzle Aspect Ratio on Stagnation Region Heat Transfer Characteristics of Elliptic Impinging Jet,' Int. J. Heat and Mass Transfer, Vol. 43, pp.555-575 crossref(new window)

윤순현, 김동건, 김문경, 1999, '2차원 채널 충돌제트에서 난류강도의 변화에 대한 유동 및 열전달 특성,' 대한기계학회논문집 B 권, 제 23 권, 제6호, pp.753-760

Baughn, J. W. and Shimizu, S., 1989, 'Heat Transfer Measurement From a Surface With Uniform Heat Flux and an Impinging Jet,' ASME J. Heat Transfer, Vol. 111, pp.1096-1098

Kline, S. J. and Mcklintock, F. A., 1953, 'Describing Uncertainties in Single Sample Experiments,' Mech. Eng. Vol. 5, pp. 5-8

Lee, D., Greif, R., Lee, S. J. and Lee, J., 1995, 'Heat Transfer from a Flat Plate to a Fully Developed Axisymmetric Impinging Jet,' ASME J. Heat Transfer, Vol.117,pp.772-776

Gardon, R. and Akfirat, J. C., 1965, 'The Role of Turbulence in Determining the Heat Transfer Characteristics of Impinging Jets,' Int. J. Heat and Mass Transfer, Vol. 8,pp.1261-1272 crossref(new window)

Gardon, R. and Akfirat, J. C., 1966, 'Heat Transfer Characteristics of Impinging Two-dimensional Air Jets,' ASME J. Heat Transfer, Vol. 88, pp.101-108