Showing papers by "Ephraim M Sparrow published in 1983"
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TL;DR: In this article, the authors investigate the heat transfer and fluid flow characteristics of arrays of heat-generating, block-like modules affixed to one wall of a parallel-plate channel and cooled by forced convection airflow.
116 citations
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TL;DR: In this paper, the effects of varying the spacing between the corrugated walls and of different fluid flow inlet conditions were determined experimentally for water flowing in a corrugation-wall duct.
97 citations
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TL;DR: Etude experimentale du transfert de chaleur et de la perte de charge dans une conduite rectangulaire aplatie munie de barres transversales adjacentes a une paroi a repartition periodique as discussed by the authors.
Abstract: Etude experimentale du transfert de chaleur et de la perte de charge dans une conduite rectangulaire aplatie munie de barres transversales adjacentes a une paroi a repartition periodique
89 citations
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TL;DR: In this paper, a solution methodology has been employed that enables the fully developed regime in a duct of periodically varying cross section to be determined without dealing with the entrance region of the duct.
Abstract: A solution methodology has been employed that enables the fully developed regime in a duct of periodically varying cross section to be determined without dealing with the entrance region. ...
72 citations
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TL;DR: In this paper, the authors considered natural convection flows induced in vertical channels by heat sources situated at the channel inlet, where a channel plume is created by a horizontal line source, while a chimney-like flow is induced by a uniformly distributed source.
Abstract: Natural convection flows induced in vertical channels by heat sources situated at the channel inlet are considered. A channel plume is created by a horizontal line source, while a chimneylike flow is induced by a uniformly distributed source. Numerical solutions were carried out for both problems. Supplementary results were obtained from a fully developed model, which was further specialized for the case in which buoyancy effects dominate the frictional effects. Results were also adapted from available solutions for the classical free plume. For short, wide channels, the uniformly distributed source induces a larger mass flow than does a line source of the same strength, while for tall, narrow channels, the induced flows are equal. On the other hand, the bulk temperature rise associated with the uniform source is smaller than (or, in the limit, equal to) that associated with an equal-strength line source. Furthermore, for short, wide channels, the mass flow and bulk temperature results for the ch...
40 citations
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38 citations
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TL;DR: In this paper, the authors performed fundamental heat transfer experiments for freezing of an initially superheated or nonsuperheated liquid in a cooled vertical tube, which yielded information about the freezing front and the frozen mass, about various energy components extracted from the tube, and about the decay of the initial liquid superheat.
Abstract: Fundamental heat transfer experiments were performed for freezing of an initially superheated or nonsuperheated liquid in a cooled vertical tube. Measurements were made which yielded information about the freezing front and the frozen mass, about the various energy components extracted from the tube, and about the decay of the initial liquid superheat. Four component energies were identified and evaluated from the experimental data, including the latent energy released by the phase change and sensibly energies released from the subcooled frozen solid and the superheated liquid. Initial superheating of the liquid tended to moderately diminish the frozen mass and latent energy extraction at short freezing times but had little effect on these quantitites at longer times. The extracted sensible energies associated with the superheating more than compensated for the aforementioned decrease in the latent energy. Although the latent energy is the largest contributor to the total extracted energy, the aggregate sensible energies can make a significant contribution, especially at large tube wall subcooling, large initial liquid superheating, and short freezing time. Natural convection effects in the superheated liquid were modest and were confined to short freezing times.
37 citations
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34 citations
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TL;DR: In this paper, the authors determined the heat transfer coefficients for natural convection in the enclosed space between two vertical cylinders maintained at different uniform temperatures, and compared the experimental and numerical results.
31 citations
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TL;DR: In this paper, both analytical and numerical techniques were employed to solve for the velocity and temperature fields in a two-dimensional mixed convection plume for the Prandtl number range from 0.72 to infinity.
16 citations
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TL;DR: In this paper, the per-slat heat transfer coefficient was measured for an array of co-planar slat-like surfaces which face upstream into an oncoming flow.
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TL;DR: In this paper, per-tube heat transfer coefficients were determined in a tube bank in the presence of an abrupt upstream enlargement of the flow cross section, either at the inlet face of the tube bank or at the upstream end of a duct which delivered the flow to the basin.
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TL;DR: Mesure de la repartition axiale et circonferencielle du coefficient de transfert de chaleur dans un tube avec entree d'air fortement oblique par rapport a l'axe du tube as discussed by the authors.
Abstract: Mesure de la repartition axiale et circonferencielle du coefficient de transfert de chaleur dans un tube avec entree d'air fortement oblique par rapport a l'axe du tube
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TL;DR: In this article, a short horizontal cylinder affixed to an equi-temperature vertical plate for the condition that the plate and the cylinder form one wall of a vertical duct was measured.
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TL;DR: In this article, a finite-difference marching scheme was employed to obtain numerical solutions for a wall plume spawned by the discharge from a vertical, natural convection channel flow.
Abstract: A finite-difference marching scheme was employed to obtain numerical solutions for a wall plume spawned by the discharge from a vertical, natural convection channel flow. The plume is bounded by an isothermal vertical wall that is the continuation of one of the walls of the channel. The wall-plume solutions were carried out for a range of dimensionless heights of the channel and for a Prandtl number of 0.7. Since the channel height controls the velocity and temperature profiles at the channel exit, it also plays a key role in the development of the wall plume because these profiles serve to initiate the plume. Just downstream of the channel exit, the newly exposed flank of the plume interacts with and is cooled by the ambient fluid, while the wall-adjacent portion of the plume retains its channel heritage. Subsequently, the ambient fluid penetrates deeply into the plume, effectively obliterating its channel origins. Thereafter, the plume approaches a natural convection vertical-plate boundary lay...