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Pg0090im - PRflBLEM 2.1{Earth aim =qtau*a = tflttvacema...

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Unformatted text preview: PRflBLEM 2.1? {Earth} aim =qtau *a... = tflttvacema — 15.0 arm.giflfiim.£-lfi rim = that — liltijw = 49.5 w where q. = kflficfiTgffixg. Applying Fuurier‘s law to she imn samplc. amass _ ass Watlfllfi rn Ace-T: ' stanza mJIMaISJP-C The turn] drup scruss the inn sauasle is tJ‘Cititlflfi] = 60°C: the heater temperature is (T? + hill“: = 137°C. Hence the average temperature at the inn sample is T=ttsr+rr}'t:t2=1c't°c=ssn tt. 45.] We curnpare this result with the tabulated value {see shave} at 330 It. Hate guud agreement. 5 kirurt = run wan-K. <2] {c} The principle advantage of having twu identical samples is the assurance that all the clecu'ical pcwer dissipated in the heater will appear as heat flew thscugh the samples. With unlv unc sample. heat can flew from the backside cf the heater even thuugh insulated. Heat leakage put the lateral surfaces of the c:,.riintl.ricall;,.I shaped samples will heccutte significant when the sample thermal ccnductivirp is cnlg slightly higher than than cf the insulating material used on these surfaces. That is. the methctd is suitable fur metallics. but must be used with cautiun un nun‘usetallic nnteriats. Fur any cumhinatiun cf materials in the upper and luwer position. we expect dT. = an. Huwevcr. it' the insularicn were impmperlv applied slung the lateral surfaces. it is pussihle that heat leakage will ctccur. This rnag.r cause 5T. at: titTg. ...
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