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In thermal engineering, Heisler charts are a graphical analysis tool for the evaluation of heat transfer in transient, one-dimensional conduction.[1] They are a set of two charts per included geometry introduced in 1947 by M. P. Heisler[2] which were supplemented by a third chart per geometry in 1961 by H. Gröber. Heisler charts permit evaluation of the central temperature for transient heat conduction through an infinitely long plane wall of thickness 2L, an infinitely long cylinder of radius ro, and a sphere of radius ro. Each aforementioned geometry can be analyzed by three charts which show the midplane temperature, temperature distribution, and heat transfer.[1]
Although Heisler–Gröber charts are a faster and simpler alternative to the exact solutions of these problems, there are some limitations. First, the body must be at uniform temperature initially. Second, the Fourier's number of the analyzed object should be bigger than 0.2. Additionally, the temperature of the surroundings and the convective heat transfer coefficient must remain constant and uniform. Also, there must be no heat generation from the body itself.[1][3][4]
^ abcCengel, Yunus A. (2007). Heat and Mass Transfer: A Practical Approach (3rd edition ed.). McGraw Hill. pp. 231–236. ISBN 978-0-07-312930-3.
^Transactions ASME, 69, 227–236, 1947
^"Unsteady State Basics". 21 December 2008.
^"Heat conduction in cylinder". www.scribd.com. Archived from the original on 2012-11-02.
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