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Influence of coil characteristics on heat transfer to Newtonian fluidsPrabhanjan, Devanahalli G. January 2000 (has links)
A water bath thermal Processor was designed and built to study the influence of helical coil characteristics on heat transfer to Newtonian fluids like water and base oil with three different viscosities. The system consisted of a thermally insulated water bath, an electric heater, pump to re-circulate water in the bath and for pumping the processing fluid through the coil, copper helical coils and a storage tank for the processing fluid. / Comparative study has shown that the outer and total heat transfer coefficients were significantly lower in natural than in forced convection water bath. However, inner heat transfer coefficient was not significantly affected. Flow rate as low as 0.001 m.s-1 in the water bath improved the outer and total heat transfer coefficients by 35 and 22% respectively. One could expect a higher rate with an increase in water re-circulation rate inside the water bath. Percent rise in heat transfer was limited to seven with respect to inner heat transfer. With the Pearson correlation, it was possible to express total heat transfer rate directly in terms of outer and inner rates. Significant interactions were observed between variables and constants. / Experiments with 2 pitch cases were conducted with water to water heat transfer using coils to determine the Nusselt number correlation for natural convection. Characteristic lengths were changed in the models. The Nusselt number was under-predicted by 25 to 37% for water bath temperatures of 75° and 95°C respectively. Flow rate inside the coil had slight effect on Nusselt number due to change in the temperature gradient along the length of the coil. / Studies conducted with three base oils have shown significant difference in viscosity after heating the oil for several turns. Each fluid was heated in a distinct flow regime. The observed Nusselt number inside the coil for low Reynolds number was as high as an order of magnitude than the predicted values calculated by Seider-Tate relation for laminar flow. Vorticies formed associated with the eddy structure could very well be the cause for this kind of rise in the value. / Preliminary study conducted has shown a higher rise in temperature of processing fluid in case of helical coil compared to that of a straight tube. Larger the diameter of the tube better was the heat transfer. An elevated bath temperature had higher heat transfer.
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Downward two phase flow in vertical tubesChase, Sherwin January 1971 (has links)
In the present work, experimental data is obtained for the amount of air entrained by water and sugar solutions, of viscosities 3.6 and 4.7 centipoises, flowing down pipes of diameters 1.0, 1.5 and 2.0 inches. The dynamics of vapour entraining flow is discussed, and a method for calculating liquid flow rate at which pipe flows full is suggested. The experimental results have been presented in terms of some of the common dimensionless groups used in fluid mechanics in an attempt to develop an overall correlation scheme.
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Downward two phase flow in vertical tubesChase, Sherwin January 1971 (has links)
No description available.
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Stability of a flexible cylinder in axisymmetrically confined flowSim, Woo-Gun January 1987 (has links)
No description available.
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Influence of coil characteristics on heat transfer to Newtonian fluidsPrabhanjan, Devanahalli G. January 2000 (has links)
No description available.
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On the dynamics of three systems involving tubular beams conveying fluidLuu, T. Phuong. January 1983 (has links)
No description available.
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Roughness factors and water conveyance capacities of corrugated plastic tubingPelletier, Marc-Antoine. January 1984 (has links)
No description available.
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Dynamics and stability of curved pipes conveying fluidVan, Ke Sum. January 1986 (has links)
No description available.
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On the dynamics of three systems involving tubular beams conveying fluidLuu, T. Phuong. January 1983 (has links)
No description available.
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Dynamics and stability of curved pipes conveying fluidVan, Ke Sum. January 1986 (has links)
No description available.
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