Q1) A steel cylinder 10 cm in diameter and 10 cm long is initially at 300 °C. It issuddenly immersed in an oil bath that is maintained at 40 °C, with h=280 W/m² °C. Find:(a) The temperature at the center of the solid after 2 min, and(b) The temperature at the center of one of the regular faces after 2 min.Answersa) T = 175 °Cb) T = 151 °C

The properties of steel cylinders are considered. Biot number is calculated. The other dimensionless…

Answered: Q1) A steel cylinder 10 cm in diameter…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Heat Transfer 176 Convection Ex. 3.15: air at 101.325 kPa and 308 K (35 °C) flows across a 50 mm diameter cylinder at a velocity of 50 m/s. The cylinder surface is maintained at a temperature of 423 K (150 °C). Estimate the heat loss per unit length of the cylinder. Data: The physical properties of air at the film temperature of 365.5 K are: H= 2.14 x 10-5 kg/(m-s), p = 0.966 kg/m³, k = 0.0312 W/(m-K) and Npr 0.695.
A tube with outer diameter of 2 cm is maintained at uniform temperature and is covered with an insulating layer (k = 0.18 W/m.K) in order to reduce the heat loss. Heat is dissipated from the outer surface of insulation with h = 12 W/m2.K into an ambient at constant temperature. Determine the critical thickness of insulation. Calculate the ratio of heat loss from the tube with insulation to heat loss without insulation for (i) the thickness of insulation equal to the critical thickness, and (ii) the thickness of insulation 2.5 cm thicker than the critical thickness.
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Transport Phenomena Question
A steam pipe with 80 mm diameter passes through a room at 25°C (both air and walls). The pipe is painted to white and its surface temperature is 180°C. Determine the total rate of heat loss from the surface per unit length of pipe, if the convective heat transfer coefficient is 15 W/m2⋅K
A window is made up of two panes of glass (with surface temperatures of 15 °C and 5 °C) that are separated by a gap of 3 cm. The said window has a height of 2 m and a width of 5 m. Initially, the gap is filled with air (flowing via temperature gradient). Then, this air space is partially evacuated such that the pressure is already 0.3 atm. This is done to lessen the heat transfer between the two panes of glass. Both glass surfaces have an emissivity of 0.9. Calculate the rate of heat transfer (W) through the panes.
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