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Showing papers by "Ephraim M Sparrow published in 2019"


Journal ArticleDOI
01 Mar 2019-Burns
TL;DR: This investigation deals with how contact between a hot, highly conductive metallic material and skin gives rise to burns, and finds that the most important parameters are the surface temperature and exposure duration.

15 citations


Journal ArticleDOI
TL;DR: In this paper, numerical results for both laminar and turbulent flow and heat transfer for an in-line tube bank ranging in size from 1 to 20 tube rows over a Reynolds number range of 100-1000 were presented.

14 citations


Journal ArticleDOI
TL;DR: In this article, a broad ranging study of the fluid flow in packed beds of uniform diameter spheres has been implemented by the method of numerical simulation, which encompassed both laminar and turbulent flows, random and regular packings of the spheres, bed containments in both rectangular ducts and circular pipes, and beds of either bounded or unbounded lateral extent.

11 citations


Book ChapterDOI
01 Jan 2019
TL;DR: In this article, an extensive review of the literature is presented and brought together in a single repository to answer some critical issues such as: which CFD models are most able to calculate fluid drag and heat transfer between the fluid and the cylinder, what are the mesh requirements for hydrodynamic and thermal analysis, how important is the blockage effect for cylinders that are placed in confined spaces (such as wind tunnels), Do upstream effects significantly alter the results, and what aspect ratio is sufficient for a three-dimensional prism to approximate a two-dimensional square cylinder?
Abstract: The canonical problem of flow over a square cylinder has been studied extensively in the scientific literature. Nevertheless, there are some critical issues which are not fully understood. Here, an extensive review of the literature is presented and brought together in a single repository. Next, remaining questions are identified such as: Which CFD models are most able to calculate fluid drag and heat transfer between the fluid and the cylinder? What are the mesh requirements for hydrodynamic and thermal analysis? How important is the blockage effect for cylinders that are placed in confined spaces (such as wind tunnels)? Do upstream effects significantly alter the results (such as upstream flow development, velocity profile, and turbulence intensity)? What aspect ratio is sufficient for a three-dimensional prism to approximate a two-dimensional square cylinder? Finally, how do three-dimensional flow patterns differ from those in two-dimensions? This manuscript attempts to answer these questions and provide practical recommendations to academic and industrial scientists. One key result from this work is the development of new correlating equations for both the drag coefficient and the Nusselt number for a wide range of Reynolds numbers and thermal conditions. The results presented here agree very well with accepted correlations from the literature, however these new correlations cover a much wider range of Reynolds numbers than previously published correlating equations.

11 citations


Journal ArticleDOI
TL;DR: The turbulent transition model has been applied to fluid flow problems that can be laminar, turbulent, transitional, or any combination and is shown to predict fully developed friction factors for the entire range of Reynolds numbers as well as velocity profiles for both laminationar and turbulent regimes.
Abstract: A turbulent transition model has been applied to fluid flow problems that can be laminar, turbulent, transitional, or any combination. The model is based on a single additional transport equation for turbulence intermittency. While the original model was developed for external flows, a slight modification in model constants has enabled it to be used for internal flows. It has been successfully applied to such flows for Reynolds numbers that ranged from 100 to 100,000 in circular tubes, parallel plate channels, and circular tubes with an abrupt change in diameters. The model is shown to predict fully developed friction factors for the entire range of Reynolds numbers as well as velocity profiles for both laminar and turbulent regimes.

10 citations


Journal ArticleDOI
TL;DR: In this paper, an experimentally validated computational model is used to determine quantitative information on convective heat transfer coefficients on all of the external surfaces of a generic residence, and the model was used to evaluate the convective transfer coefficients.
Abstract: An experimentally validated computational model is used to determine quantitative information on convective heat transfer coefficients on all of the external surfaces of a generic residence. The mo...

6 citations