A bonding operation utilizes a laser to provide a constant heat flux, q0, across the top surface of a thin adhesive-backed, plastic film to be affixed to a metal strip as shown in the sketch. The metal strip has a thickness d = 1.25 mm and its width is large relative to that of the film. The thermo physical properties

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A bonding operation utilizes a laser to provide a constant heat flux, q"0, across the top surface of a thin adhesive-backed, plastic film to be affixed to a metal strip as shown in the sketch. The metal strip has a thickness d = 1.25 mm and its width is large relative to that of the film. The thermo physical properties of the strip are p = 7850 kg/m3, c p = 435J/kg. K, and k = 60 W/m ∙ K. The thermal resistance of the plastic film of width W1 = 40 mm is negligible. The upper and lower surfaces of the strip (including the plastic film) experience convection with air at 25°C and a convection coefficient of 10 W/m2 ∙ K. The strip and film are very long in the direction normal to the page. Assume the edges of the metal strip are at the air temperature (To)



Laser source, 9% Plastic film- Ts h oof Metal strip W2


(a) Derive an expression for the temperature distribution in the portion of the steel strip with the plastic film (-w1/2 (b) If the heat flux provided by the laser is 10,000 W/m2, determine the temperature of the plastic film at the center (x = 0) and its edges (x = ± w1/2).

(c) Plot the temperature distribution for the entire strip and point out its special features.

Distribution
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Related Book For answer-question

Fundamentals of Heat and Mass Transfer

6th Edition

Authors: Incropera, Dewitt, Bergman, Lavine

ISBN: 978-0471457282