(熱傳導的)對流系數

CNVCOF
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CNVCOF Ftype, Cnvcof or CNVCOF Ftype, Ndata
Temp(1), Cnvcof(1)
: :
Temp(Ndata), Cnvcof(Ndata)
(函數的定義)


OPERAND DESCRIPTION DEFAULT
運算符默認值
Ftype Function type: 0
Ftype 函數類型:0
0 = Constant convection coefficient
0=常值對流系數
1 = Temperature dependent convection coefficient
1=依賴溫度的對流系數
Cnvcof Convection coefficient 0.02 (N/sec/mm/C)
對流系數值0.02(牛/秒/毫米/度)
or
0.77E-05 (Btu/sec/in 2 /F)
英制單位時的值以及單位
Ndata Number of temp/convection coeff data pairs None
Ndata 溫度/對流系數數據對的序號
Temp(i) Temperature of i th data pair None
Temp(i) 第i對溫度數據
Cnvcof(i) Convection coefficient of i th data pair None
Cnvcof(i) 第i對對流系數數據



DEFINITION
定義
CNVCOF specifies the convection coefficient which is used in determining convection heat transfer.
CNVCOF 定義了用于確定對流熱傳導的對流系數。



REMARKS
備注
The convection coefficient may be specified as a constant value or as a set of discrete temperature/coefficient data pairs.
對流系數可以被定義為一個常值或是一系列離散的溫度/系數數據對。
If Ftype = 1 use the operand Cnvcof.
如果 Ftype=1時 使用運算符Cnvcof。
If Ftype = 2 use the operands Ndata, Temp(i), Cnvcof(i). Each temperature/coefficient pair should be provided on a separate line.
如果 Ftype=2時 使用運算符Ndata,Temp(i),Cnvcof(i)。每個溫度/系數對應該由分離的序數列提供。
When temperatures lie within the specified data range, linear interpolation is used to determine the convection coefficient. When
當溫度值位于給定的數據范圍時,使用線性插值法確定對流系數。
temperatures lie outside the specified data range, linear extrapolation is used to determine the convection coefficient.
當溫度值位于給定的數據范圍時,使用線性插值法確定對流系數。
The default values represent free air convection.
默認值代表的是自由空氣的對流系數。
Free air and forced air convection coefficient ranges are listed below [2].
自由空氣和壓縮空氣的對流系數范圍列于下表:

Mode
Btu/sec/in2/F
N/sec/mm/C
Free air convection
1.93x10-6 - 9.645x10-6
5x10-3 - 25x10-3
Forced air convection
3.86x10-6 - 192.9x10-6
10x10-3 - 500x10-3


The equation for convection heat transfer is:
對流熱傳導方程:
q
c = ACnvcof(T s -Etemp)
where
這里
q c heat transfer associated with convection
qc 與對流對應的熱傳導量
A convection heat transfer area

A 對流熱傳導面積
Cnvcof
convection coefficient

Cnvcof 對流系數
T
s surface temperature
Ts 表面溫度
Etemp
environmental temperature

Etemp 環境溫度
Applicable simulation types: Heat Transfer
適用的模擬類型:熱傳導
Non-Isothermal Deformation

非等溫變形



RELATED TOPICS
相關主題
Keywords: ENVTMP
關鍵字:ENVTMP
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