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To determine air velocity changes, it is proposed to

Introduction to Heat Transfer | 6th Edition | ISBN: 9780470501962 | Authors: Theodore L. Bergman ISBN: 9780470501962 111

Solution for problem 7.59 Chapter 7

Introduction to Heat Transfer | 6th Edition

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Introduction to Heat Transfer | 6th Edition | ISBN: 9780470501962 | Authors: Theodore L. Bergman

Introduction to Heat Transfer | 6th Edition

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Problem 7.59

To determine air velocity changes, it is proposed to measure the electric current required to maintain a platinum wire of 0.5-mm diameter at a constant temperature of 77 C in a stream of air at 27 C. (a) Assuming Reynolds numbers in the range 40 ReD 1000, develop a relationship between the wire current and the velocity of the air that is in cross flow over the wire. Use this result to establish a relation between fractional changes in the current, I/I, and the air velocity, V/V. (b) Calculate the current required when the air velocity is 10 m/s and the electrical resistivity of the platinum wire is 17.1 105 m.

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Day 10­Binary ­Base ten numbers are decimal numbers ­Binary numbers are base 10 (only 1 and 0, on or off.) ­every binary has a unique decimal value and vice versa ­decimal numbers only have digits from 0­9, and they don’t have to have a decimal in them (ex.33, 493, 39393) ­example, how to get the decimal number 15 is (1x10^1)+(5x10^0) ­the value of a binary number and decimal number are different. If you see a number of only ones or zeroes, you have to be told whether it is decimal or binary ­check the lecture slides for this day Day 11 ­ a breakpoint is a red point that stops to check what is happening ­the for loop is used when you want the calculations to be performed a certain number of times ­the first statement is how many times the statement will be executed

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Chapter 7, Problem 7.59 is Solved
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Textbook: Introduction to Heat Transfer
Edition: 6
Author: Theodore L. Bergman
ISBN: 9780470501962

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To determine air velocity changes, it is proposed to