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Searle's bar method
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Searle's bar method : ウィキペディア英語版
Searle's bar method
Searle's bar method is an experimental procedure to measure thermal conductivity of material. A bar of material is being heated by steam on one side and the other side cooled down by water while the length of the bar is thermally insulated. Then the heat Δ''Q'' propagating through the bar in a time interval of Δ''t'' is given by
:\left(\frac\right)_\mathrm = -kA \frac
where
* Δ''Q'' is the heat supplied to the bar in time Δ''t''
* ''k'' is the coefficient of thermal conductivity of the bar.
* ''A'' is the cross-sectional area of the bar,
* Δ''T''bar is the temperature difference of both ends of the bar
* 'L'' is the length of the bar
and the heat Δ''Q'' absorbed by water in a time interval of Δ''t'' is:
:\left(\frac\right)_\mathrm = C_\mathrm \frac \Delta T_\mathrm
where
* ''C''w is the specific heat of water,
* Δ''m'' is the mass of water collected during time Δ''t'',
* Δ''T''water is difference in the temperature of water before and after it has gone through the bar.
Assuming perfect insulation and no energy loss, then
:\left(\frac\right)_\mathrm = \left(\frac\right)_\mathrm
which leads to
: k = -C_\mathrm \frac \frac \frac}
== References ==

*

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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