﻿ Heat Radiation by Natural Convection(Steady-State Analysis)Examples | Product | Murata Software Co., Ltd.

# Example5Heat Radiation by Natural Convection(Steady-State Analysis)

General

• The heat radiation from an aluminum plate is analyzed.

• The heat transfer coefficient is acquired manually.
To acquire it automatically, see “Exercise 14: Natural Convection with Correction Coefficient Automatically Calculated”.

• The temperature distribution and the heat flux vectors are solved.

• Unless specified in the list below, the default conditions will be applied.

### Analysis Space

 Item Settings Analysis Space 3D Model unit mm

### Analysis Conditions

 Item Settings Solvers Thermal Analysis [Watt] Analysis Type Steady-state analysis Options N/A

### Model

Aluminum plate, defined by a rectangular solid body, is placed vertically. The bottom face is set with the Temperature boundary condition.

The other faces are set with the Heat transfer/Ambient radiation boundary condition.

### Body Attributes and Materials

 Body Number/Type Body Attribute Name Material Name 0/Solid VOL1 404 Pure-Al1100 *

* Available from the Material DB

### Boundary Conditions

The coefficient for the natural convection is given by the formula below. See [Heat Transfer/Ambient Radiation] for more information.

The coefficient can be calculated automatically if that is preferred.

2.51×C×（1/L)＾（1/4） = 2.50 [W/m2/deg5/4]

where

C = 0.56

L = 0.1

 Boundary Condition Name/Topology Tab Boundary Condition Type Settings Temp/Face Thermal Temperature 80[deg] Outer Boundary Condition Thermal Heat Transfer/Ambient Radiation Natural convection: 2.50[W/m2/deg5/4] Room Temperature : 25[deg]

### Results

The temperature distribution is shown below.

The temperature is 80[deg] at the bottom face and it decrease gradually to 72[deg] at higher places.

The vectors of the heat flux are shown below.

Heat flux vectors point from higher temperature towards lower temperature. Their magnitude indicates the temperature gradient.

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