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Showing papers by "Ephraim M Sparrow published in 2005"


Journal ArticleDOI
TL;DR: In this article, a method was developed for determining the streamwise variation of the temperature of a moving sheet in the presence of a co-flowing fluid, which does not depend on any material property of the sheet, its velocity, or its thickness.

131 citations


Journal ArticleDOI
TL;DR: In this article, the relative velocity between the two media is used in conjunction with the drag-force formula for the dominant of the two motions acting alone, and the results of exact solutions demonstrate that this model is flawed and underpredicts the drag force.

72 citations


Journal ArticleDOI
TL;DR: The Green's function solution method is a direct and powerful tool for solving heat transfer problems associated with flow through passages and is also an equally powerful tool when these passages are filled with saturated porous materials as mentioned in this paper.

36 citations


Journal ArticleDOI
TL;DR: It was found that the device designed to focus the cleaned air in the sleeping space fulfilled its goal and was clearly superior to all of the other air-cleaning devices.
Abstract: UNLABELLED Comprehensive quantitative experiments were performed to assess the capabilities of several air-cleaning devices to create a particle-free microenvironment as a therapy for sleeping persons affected by allergic rhinitis and asthma. Six devices were evaluated, of which five were portable and intended to provide general air cleaning for bedroom-sized spaces. The sixth was intended for installation in front of the headboard of a bed and was designed to provide clean air focused in a space occupied by a sleeping person. The air-cleaning methods of the selected devices included high-efficiency particulate air (HEPA) filtering and electrostatic precipitation. Particle concentration measurements for six particle-size ranges and sound intensity measurements were made during 8-h, sleep-simulating periods. The effects of four parameters were studied: (i) device location, (ii) controlled air motion in the laboratory, (iii) airflow rate setting of the air-cleaning device, and (iv) controlled disturbances. To ensure a totally objective study, a special laboratory facility was constructed which enabled complete control of the experimental conditions. The measured concentration histories provided comprehensive evidence of the relative capabilities of the various devices for the specific air-cleaning function. It was found that the device designed to focus the cleaned air in the sleeping space fulfilled its goal and, in that regard, was clearly superior to all of the other air-cleaning devices. PRACTICAL IMPLICATIONS There is evidence that allergic reactions are triggered by the presence of airborne particles and that these reactions can be mitigated by particle removal. This strategy can be implemented by the use of air-cleaning devices which are capable of creating particle-free zones at locations where human activity occurs. In particular, the creation of a particle-free zone which encompasses the breathing space of a sleeping person holds promise of mitigating sleep-disturbing allergic reactions.

29 citations


Journal ArticleDOI
TL;DR: In this paper, the authors used the Design of Simulation (DOS) method to guide and enhance a numerical simulation of fluid flow and heat transfer through offset-fin arrays which form the interior geometry of a cold plate.
Abstract: The method of Design of Simulation (DOS) was used to guide and enhance a numerical simulation of fluid flow and heat transfer through offset-fin arrays which form the interior geometry of a cold plate. The basic problem involved 11 independent parameters. This prohibitive parametric burden was lessened by the creative use of nondimensionalization that was brought to fruition by a special transformation of the boundary conditions. Subsequent to the reduction of the number of parameters, the DOS method was employed to limit the number of simulation runs while maintaining an accurate representation of the parameter space

18 citations