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T. C. Wong

Bio: T. C. Wong is an academic researcher from University of Minnesota. The author has contributed to research in topics: Mass transfer coefficient & Reynolds number. The author has an hindex of 1, co-authored 1 publications receiving 113 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors measured the transfer coefficients resulting from the impingement of a slot jet on a plane surface using naphthalene sublimation technique and found that the surface distributions of the transfer coefficient were bell-shaped, with the largest value at the stagnation point.

121 citations


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Book ChapterDOI
TL;DR: In this article, the authors present a comprehensive survey emphasizing the engineering applications and empirical equations, presented for the prediction of heat and mass transfer coefficients within a large and technologically important range of variables.
Abstract: Publisher Summary Heating or cooling of large surface area products is often carried out in devices consisting of arrays of round or slot nozzles, through which air impinges vertically upon the product surface. This chapter presents a comprehensive survey emphasizing the engineering applications and empirical equations, presented for the prediction of heat and mass transfer coefficients within a large and technologically important range of variables. The local variations of the transfer coefficients are based on the experimental data for single round nozzles (SRN), arrays of round nozzles (ARN), single slot nozzles (SSN), and arrays of slot nozzles (ASN). The variation of local transfer coefficients is graphically represented. It also explores how to apply these equations in heat exchanger and dryer design as well as in optimization. The flow field of impinging flow is diagrammatically represented. External variables influencing heat and mass transfer in impinging flow depends on mass flow rate, kind and state of the gas and on the shape, size, and position of the nozzles relative to each other and to the solid surface. The design of high-performance arrays of nozzles is also discussed.

1,548 citations

Journal ArticleDOI
TL;DR: In this article, the authors examined the local heat transfer characteristics of air jet impingement at nozzle-plate spacings of less than one nozzle diameter using an infrared thermal imaging technique.

553 citations

Journal ArticleDOI
TL;DR: The naphthalene sublimation method can be used to study mass and heat transfer with confidence for a variety of applications, but with certain restrictions as discussed by the authors, such as high-velocity flows.

386 citations

Journal ArticleDOI
TL;DR: In this article, the authors studied the effect of a confined impinging jet on the heat transfer in the Navier-Stokes equations and found that the instantaneous flow fields and heat transfer distributions are highly unsteady and oscillatory in nature.
Abstract: Unsteady heat transfer caused by a confined impinging jet is studied using direct numerical simulation (DNS). The time-dependent compressible Navier-Stokes equations are solved using high-order numerical schemes together with high-fidelity numerical boundary conditions. A sixth-order compact finite difference scheme is employed for spatial discretization while a third-order explicit Runge-Kutta method is adopted for temporal integration. Extensive spatial and temporal resolution tests have been performed to ensure accurate numerical solutions. The simulations cover several Reynolds numbers and two nozzle-to-plate distances. The instantaneous flow fields and heat transfer distributions are found to be highly unsteady and oscillatory in nature, even at relatively low Reynolds numbers. The fluctuation of the stagnation or impingement Nusselt number, for example, can be as high as 20 percent of the time-mean value. The correlation between the vortex structures and the unsteady heat transfer is carefully examined. It is shown that the fluctuations in the stagnation heat transfer are mainly caused by impingement of the primary vortices originating from the jet nozzle exit. The quasi-periodic nature of the generation of the primary vortices due to the Kelvin-Helmholtz instability is behind the nearly periodic fluctuation in impingement heat transfer, although more chaotic and non-linear fluctuations are observed with increasing Reynolds numbers. The Nusselt number distribution away from the impingement point, on the other hand, is influenced by the secondary vortices which arise due to the interaction between the primary vortices and the wall jets. The unsteady vortex separation from the wall in the higher Reynolds number cases leads to a local minimum and a secondary maximum in the Nusselt number distribution. These are due to the changes in the thermal layer thickness accompanying the unsteady flow structures.

154 citations

Journal ArticleDOI
TL;DR: In this article, the Nusselt number was observed to correlate approximately with Re 0.5 and Re 1.8 for initially turbulent and laminar jets, respectively, for both free-surface and submerged jet configurations.

122 citations