冶金传输原理实验报告(传热学)
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课程编号:03402720
课程名称:冶金传输原理
冶金传输原理实验报告
(传热学)
Speciality________________
Class ___________________
Order number_______________
Name __________________
实验一 粉末或散装材料导热系数测定实验报告
测量数据记录:
2.the power of the electric heater (it is the heat transfer quantity)电加热器功率(亦即传热量)
the current (电流): =I (A ) the voltage (电压降): =V (V ) 3.the material of the experiment (实验材料):
Ⅱ. Data reduction (数据整理)
The temperature of the outer wall of the small ball
(小球外壁温度):
The temperature of the inner wall of the big ball
(大球内壁温度):
The heat transfer quantity (传热量): ==IV Q w
Ⅲ. The result of the experiment (数据整理):
1、 实 验 结 果 , 的 导 热 系 数
coefficient =-=2
19952
.0w w t t Q
λ C m w o ⋅/
2. when compare it with the theoretical value, the comparing result is:
与 理 论 值 相 比 较 结 果 是:
TestTwo To measure the guideline equation and the mean convection heat transfer coefficient when the air vertically sweeps along the single-pipe
实验二 空气横掠单管时平均对流换热系数及准则方程式测定实验
Ⅰ.To record the measuring data.(测量数据记录) 1.the size of the model :(试件尺寸) the outer diameter (外径): D = m, the effective length (有效长度): L= 0.1m. the area of dissipation (散热面积):==DL A π m 2. 2.the atmospheric temperature (大气温度):=f t o C, the corresponding thermo emf (大气温度对应热电势):)0,(f t E = mV , the atmosphere density (we refer to the table from f
t ).
大气密度(用f t 查表得)=ρ kg/m 3.
3.the measured value in every operation condition.
Ⅲ. The result of the experiment (实验结果) 1.from :(根据)
⎪⎪⎩⎪⎪⎨⎧=+=+∑∑∑∑∑=====10
1101101
1011012
10i i i i i i i i i i i y b x n y x x b x n ⎪⎪⎩
⎪⎪⎨⎧--=--=→∑∑∑∑∑∑∑∑∑∑∑)(10)())(())(()(10)()(10))((22222i i i i i i i i i i i i i x x x y x y x b x x y x y x n we get (解出得)⎩⎨⎧=
=
n C (C b ln =)
2. we get the guideline equation is (得出的准则方程是):
Test Three To measure the angle factor from the infinitesimal
element surface dA 1 to the finite surface A 2
实验三 微圆表面dA 1到有限表面A 2的角系数测定实验报告
Ⅰ.To record the measuring data.(测量数据记录)
(计算角系数时数据): the size of a, b, c in the Fig 4 of the experiment guide book . (实验指导书图中a 、b 、c 尺寸): a = mm ; b = mm, c = mm.
b a
x =
= ; b
c y == . Ⅱ. Data reduction an
d th
e result o
f the experiment (数据整理及结果)
1. 2
21
R A F sp
A dA π=
-= ;
2.)1
1(212212212
1
y
x tg y x y y tg F A dA ++-=
---π= ; Ⅲ. To compare the measured angle factor with theoretical angle factor,
and analyses their fitting and the reason of it.
对测得的角系数和理论算出的角系数值进行比较,并对两者吻合情况和原因进行分析。