Air is flowing steadily through a horizontal, constant diameter pipe. The pipe wall is heated uniformly so that the temperature of the air increases as the air flows through the pipe. You may assume that the air temperature is constant across the cross-section at any length down the pipe. If the air pressure remains constant (pressure drop is small enough to ignore), what can you say about the average velocity of air in the pipe? Group of answer choices: velocity will increase because increased temperature indicates the air molecules are moving faster and have higher kinetic energy velocity will increase in the flow direction because density decreases as air temperature increases velocity will decrease because hot pipe walls will increase friction in flowing air velocity remains constant because pipe is rigid so air can’t expand or change density velocity remains constant since flow is steady
Air is flowing steadily through a horizontal, constant diameter pipe. The pipe wall is heated uniformly so that the temperature of the air increases as the air flows through the pipe. You may assume that the air temperature is constant across the cross-section at any length down the pipe. If the air pressure remains constant (pressure drop is small enough to ignore), what can you say about the average velocity of air in the pipe? Group of answer choices: velocity will increase because increased temperature indicates the air molecules are moving faster and have higher kinetic energy velocity will increase in the flow direction because density decreases as air temperature increases velocity will decrease because hot pipe walls will increase friction in flowing air velocity remains constant because pipe is rigid so air can’t expand or change density velocity remains constant since flow is steady
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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Air is flowing steadily through a horizontal, constant diameter pipe. The pipe wall is heated uniformly so that the temperature of the air increases as the air flows through the pipe.
You may assume that the air temperature is constant across the cross-section at any length down the pipe.
If the air pressure remains constant (pressure drop is small enough to ignore), what can you say about the average velocity of air in the pipe?
Group of answer choices:
velocity will increase because increased temperature indicates the air molecules are moving faster and have higher kinetic energy
velocity will increase in the flow direction because density decreases as air temperature increases
velocity will decrease because hot pipe walls will increase friction in flowing air
velocity remains constant because pipe is rigid so air can’t expand or change density
velocity remains constant since flow is steady
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