Measurement techniques in heat transfer (AGARDograph) by Ernst R. G. Eckert, Richard J. Goldstein

By Ernst R. G. Eckert, Richard J. Goldstein

Size concepts in warmth move (AGARDograph)

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Extra info for Measurement techniques in heat transfer (AGARDograph)

Example text

Then if we take, f o r simplicity, s j l = s-y 2 we have n1/n2 = 25/4 which is the ratio of the number of observations which must b e made at x1 to those a t x 2 in o r d e r to get the best results. A s another example let u s assume with these same currents that syl = 3sg2/2. We then have nl/n2 = 25/4 X 3 / 2 = 7 5 / 8 . In both of these examples it is evident that many more observations should b e made a t the lower current that a t the higher in o r d e r to obtain the best precision with a given time spent in observing.

This automatically makes the combined e r r o r of the normal and r e v e r s e readings only one in a million, for example, when the ratio a r m s are unequal by as much as a part in a thousand, and thus practically eliminates an e r r o r from lack of balance in the ratio-arms. It does not eliminate any systematic e r r o r in contact resistance at the end of the ratio a r m s on the decades, however, because the mercury reversing switch has to be in the arms. The commutators on these bridges are made so as to open the battery circuit before breaking contacts in the resistance leads to the thermometer.

2 - A - 2 ) . In this instance there is a temperature drop from the envelope to the inside wall of the triple-point-cell well through the fluid in the well, usually water. There is a further drop in temperature through the glass of the well to the outside of the well and then another small drop through the film of water outside the well before the heat reaches the water-ice surface where the fixed point temperature i s maintained by the liquid-solid equilibrium. Sometimes the temperature drop from the outside of the thermometer envelope to the temperature of interest may be made smaller by the u s e of liquids o r solids which improve the thermal contact.

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