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Dr. Kaveh Azar quotes
I advise engineers to start by performing first-order calculations to see where a heat-transfer problem lies. You can quickly estimate the heat-transfer answer to within 20 percent to 30 percent. After you have a first-order solution, use computation or experimentation to perform another, independent analysis, but do not use results from the first-order solution as boundary conditions. You want two independent answers.
~ Dr. Kaveh Azar
~ William Allingham (March 19, 1824 - November 18, 1889)