nnoD :sDbetaeu3. Temperature Rise in a Heating Wire. A current of 250 A is passing throughstainless-steel wire having a diameter of 5.08 mm. The wire is 2.44 m long and has aresistance of 0.0843 N . The outer surface is held constant at 427.6 K. The thermalconductivity is k 22.5 W/m K. Calculate the center-line temperature at steadystate.evard bae 0S008 i4R FOIns

Answered: Image /qna-images/answer/900a97f1-cd92-4456-a301-8a800b25b011.jpg

Answered: nnoD :s D betae u 3. Temperature Rise…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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please help with this im not sure what i did wrong
8. A 10 cm long metal bar has thermal diffusivity o = 1. Initially, it is at the uniform temperature of 0°C. At timet 0, the end r 0 is insulated, while the end r= 10 is heated to 100°C. Without any calculation, find a steady-state temperature distribution when the system (a) reaches a thermodynamic equilibrium. (b) Estimate the temperature at r= 5 whent 40.
6- One way of measuring the thermal conductivity of a material is to sandwich an electric thermofoil heater between two identical rectangular samples of the material and to heavily insulate the four outer edges, as shown in the figure. Thermocouples attached to the inner and outer surfaces of the samples record the temperatures. During an experiment, two 0.5-cm-thick samples 10 cm x 10 cm in size are used. When steady operation is reached, the heater is observed to draw 35Wof electric power, and the temperature of each sample is observed to drop from 82°C at the inner surface to 74°C at the outer surface. Determine the thermal conductivity of the material at the average temperature. A
1. For a steam pipe with a given diameter of 10 cm covered by two (2) layers of insulation. The first insulation has a thickness of 4 cm and a coefficient of thermal conductivity of 0.08 W/m.K. and the second insulation has a thickness of 3 cm and a thermal conductivity of 0.15 W/m.K. The steam main conveys steam at a pressure of 1.70 MPa with 25°C superheat. Outside temperature is 27°C. The pipe is 30 meters in length. (tsat @ 1.70 MPa = 204°C). Determine the following: a) The heat loss in KW b) Explain the concepts/principles that were considered and the factors that affected the condition of the above mentioned items (a & b).
Question 5:Assume steady-state, one-dimensional heat conduction through the symmetric shape shown in Figure 1.Assuming that there is no internal heat generation, derive an expression for the thermal conductivity k(x) for these conditions: A(x) = (1 -x), T(x) = 300(1 - 2x -x3),and q = 6000 W, where A is in square meters, T in kelvins, and x in meters. Consider x= 0 and 1
1a.A copper slab ( k = 372 W/m .K ) is 3mm thick . it is protected from the corrosion on each side by a 2 mm thick layer of stainless steel ( k = 17 W/m .K ) . The temperature is 40oC on one side of this composite wall and 100oC on the other. Find the temperature distribution in the copper slab and the heat conducted through the wall. Given: ksteel = 17 W/m .K kcopper = 372 W/m .K Steel Copper Steel T1 = 40oC T2 T3 T4 = 10oC q…
A multilayer wall has a thermal resistance of 0.0058 ° C/ W in the inner layer, 0.28 ° C/ W in the middle layer and 0.18 ° C/ W in the outer layer. The total temperature difference across the wall is 70 ° C. a. Find the heat flow through the wall (per unit area). b. If we increase the heat resistance in the middle layer up to 0.48 ° C/ W, then there will be a relative change in the heat flow if the temperature difference remains unchanged. Please answer as a percentage (%) of the heat flow in item a).
Please help and show all steps on how answer was solved. Class is Heat Transfer. Thank you.
inner radius ri, outer radius r0, thermal conductivity k, according to this for the thermal resistance of a hollow spherical Shell find an expression . ?
THE PROBLEM IS FROM THE BOOK: ENGINEERING THERMOFLUIDS, M. MASSOUD.
1a.A copper slab (k = 372 W/m .K) is 3mm thick . it is protected from the corrosion on each side by a 2 mm thick layer of stainless steel ( k = 17 W/m .K). The temperature is 40°C on one side of this composite wall and 100°C on the other. Find the temperature distribution in the copper slab and the heat conducted through the wall. Given: ksteel = 17 W/m .K kcopoer = 372 W/m .K Steel Copper T2 Steel T1 = 40°C T3 T4 = 10°C 2mm 3mm 2mm
Exercise 2.3:Assume that the thermal conductivity of copper is four times that of brass. Two metalrods made of copper and brass are each 20 cm long and 2.0 cm in diameter. The rods are placed end to end. The free end of the copper rod is maintained at 1000C and the free end of the brass rod is maintained at 00C. (i) What is the equilibrium temperature at the copper-brass junction? |(ii)If the thermal conductivity of copper is 390 J/m0C, at what rate, in watts, does heat flow through the rods

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