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1. A flat rectangular surface is of a size 0.5 m x 0.25 m is placed vertically. This surface is 20 K hotter (higher) than the quiescent air in contact with the surface. Therefore, heat transfer occurs between this vertical surface and the air due to free convection. In the first situation, this rectangular surface is placed as 0.5 m tall and 0.25 m wide. In the second situation, this surface is rotated 90 degree and is 0.25 m tall and 0.5 wide. What is the ratio between the heat transfer rates in these two situations, q1 and q2 ? (Neglect the radiation.)

1. A flat rectangular surface is of a size 0.5 m x 0.25 m is placed vertically. This surface is 20 K hotter (higher) than the quiescent air in contact with the surface. Therefore, heat transfer occurs between this vertical surface and the air due to free convection. In the first situation, this rectangular surface is placed as 0.5 m tall and 0.25 m wide. In the second situation, this surface is rotated 90 degree and is 0.25 m tall and 0.5 wide. What is the ratio between the heat transfer rates in these two situations, q1 and q2 ? (Neglect the radiation.)

Introduction to Chemical Engineering Thermodynamics
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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1. A flat rectangular surface is of a size 0.5 m x 0.25 m is placed vertically. This surface is 20 K hotter (higher) than the quiescent air in contact with the surface. Therefore, heat transfer occurs between this vertical surface and the air due to free convection. In the first situation, this rectangular surface is placed as 0.5 m tall and 0.25 m wide. In the second situation, this surface is rotated 90 degree and is 0.25 m tall and 0.5 wide. What is the ratio between the heat transfer rates in these two situations, q1 and q2 ? (Neglect the radiation.)
Transcribed Image Text:1. A flat rectangular surface is of a size 0.5 m x 0.25 m is placed vertically. This surface is 20 K hotter (higher) than the quiescent air in contact with the surface. Therefore, heat transfer occurs between this vertical surface and the air due to free convection. In the first situation, this rectangular surface is placed as 0.5 m tall and 0.25 m wide. In the second situation, this surface is rotated 90 degree and is 0.25 m tall and 0.5 wide. What is the ratio between the heat transfer rates in these two situations, q1 and q2 ? (Neglect the radiation.)
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