FLUENT - Forced Convection - Problem Specification

Problem Specification

This tutorial shows you how to simulate forced convection in a pipe using ANSYS FLUENT 12. The diagram shows a pipe with a heated section in the middle where constant heat flux is added at the wall. The ambient air is flowing into the pipe from the left with a uniform velocity. What will be the steady state temperature at the outlet of the pipe? How will the temperature change along the pipe? We will tackle these questions in our simulation.

Available Information

Pipe Geometry:
Circular cross-section
Pipe radius = 2.94e-2 m
Pipe length = 6.096 m

Material Properties:
Coeff. of viscosity = 1.787e-5 kg/(m s)
Cp = 1005 J/(kg K)
Thermal conductivity = 0.0266 W/(m K)
Molecular weight = 28.97 g/mole

Inlet:
• u = 25.05 m/s
• v = 0 m/s
• T = 298.15 K
• k = 0.09 m2/s2; epsilon = 16 m2/s3 (These are not measured and are rough guess values)

Outlet:
• Pressure = 97225.9 Pa

Wall:
• Heating between x = 1.83 m and x = 4.27 m
• Wall heat flux = 3473.9 W/m2
• Wall roughness: 0 (assume smooth)
• Wall thickness: 0 (assume negligible)

Ambient conditions:
• Ambient pressure = 98338.2 Pa

[*Go to Step 1: Pre-Analysis & Start-Up*]

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