Answered: Define Constant Specific Heats…

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Mechanical Engineering

Define Constant Specific Heats (Approximate Analysis)

Welding: Principles and Applications (MindTap Course List)

8th Edition

ISBN:9781305494695

Author:Larry Jeffus

Publisher:Larry Jeffus

Chapter17: Gas Tungsten Arc Welding Of Plate

Section: Chapter Questions

Problem 9R: What is the maximum gas flow rate for a nozzle size?

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Concept explainers

Thermodynamic Relations

Thermodynamics is the division of physics that deals with the transfer of any kind of energy, whether it be heat, temperature, or work, from one object to another.

Question

Define Constant Specific Heats (Approximate Analysis)

Expert Solution

Step 1

In constant specific heat assumption, the specific heat is assumed to be constant at some average value.

$s_{2} - s_{1} = \int_{1}^{2} c_{v} (T) \frac{d T}{T} + R \ln \frac{v_{2}}{v_{1}} s_{2} - s_{1} = c_{v, a v g} \ln \frac{T_{2}}{T_{1}} + R \ln \frac{v_{2}}{v_{1}}$

Similarly,

$s_{2} - s_{1} = \int_{1}^{2} c_{p} (T) \frac{d T}{T} - R \ln \frac{P_{2}}{P_{1}} s_{2} - s_{1} = c_{p, a v g} \ln \frac{T_{2}}{T_{1}} - R \ln \frac{P_{2}}{P_{1}}$

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