Get Natural Convection from Circular Cylinders PDF

By Sandra K. S. Boetcher

ISBN-10: 3319081314

ISBN-13: 9783319081311

ISBN-10: 3319081322

ISBN-13: 9783319081328

This booklet offers a concise, but thorough, reference for all warmth move coefficient correlations and knowledge for all sorts of cylinders: vertical, horizontal, and prone. This e-book covers all traditional convection warmth move legislation for vertical and vulnerable cylinders and is a wonderful source for engineers operating within the region of warmth move engineering.

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Extra resources for Natural Convection from Circular Cylinders

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3) In 1927, Koch [24] performed natural convection experiments for isothermal vertical cylinders. Koch tested four different cylinders oriented in the vertical position. 98 m, respectively. These dimensions correspond to aspect ratios between 20 and 153. The results reported are based on the diameter of the cylinder and are inconclusive. Jakob and Linke [21, 35] experimentally determined the average Nusselt numbers for natural convection for vertical cylinders situated in air in 1935. 3. 62 cm and 8 ≤ L/D ≤ 127.

30) with the exception of Eq. 31) In addition to determining local heat transfer coefficients, Fujii et al. also calculated the average heat transfer coefficients. 34) Finally, Fujii et al. suggest an equation for the average Nusselt number that can be used for water, spindle oil, or mobiltherm oil. This is the correlation that is found in Morgan [35]. 2 Early Analytical The earliest analytical prediction of Nusselt numbers from isothermal vertical cylinders was by Elenbaas [10] in 1948. Elenbaas analytically determined these Nusselt numbers by assuming that the natural convection problem may be solved using heat conduction, which was proposed by Langmuir [27].

Originally, Millsaps and Pohlhausen presented their results in terms of Nusselt and Grashof numbers in terms of the radius of the cylinder. 2. In 1970, Fujii and Uehara [11] solved for the local Nusselt number for a vertical cylinder when the equivalent local Nusselt number for a flat plate with the same boundary condition is known. 120 1 10 100 Also in 1970, Negendra et al. 43) Tcylinder = T∞ + N (x/L)n where N is a constant, n is an exponent, and x is the vertical distance measured from the base of the cylinder.

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Natural Convection from Circular Cylinders by Sandra K. S. Boetcher


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