Consider a straight cylindrical rod aluminum fin with 2 cm diameter on aluminum wall have ground surfaces and are exposed to air with a surface roughness of about 100 pin. The fin length is 10 cm, and the convection environment is at 20°C, and h- 125 W/m C. Calculate the heat transfer for fin on a wall with temperature of 200°C. What percentage reduction in heat transfer is caused by the contact conductance?

Consider a straight cylindrical rod aluminum fin with 2 cm diameter on aluminum wall have ground surfaces and are exposed to air with a surface roughness of about 100 pin. The fin length is 10 cm, and the convection environment is at 20°C, and h- 125 W/m C. Calculate the heat transfer for fin on a wall with temperature of 200°C. What percentage reduction in heat transfer is caused by the contact conductance?

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

See similar textbooks

Similar questions

i need the answer quickly
Required information Consider a 5-m-high, 8-m-long, and 0.22-m-thick wall whose representative cross section is as given in the figure. The thermal conductivities of various materials used, in W/m-K, are kA=kF=2, kg-8. kc-20, kp=15, and ke-35. The left and right surfaces of the wall are maintained at uniform temperatures of 345°C and 100°C, respectively. Assume heat transfer through the wall to be one-dimensional. Disregard any contact resistances at the interfaces. 1 cm. A4 cm B 4 cm रेव 4 cm Sem 6 cm DI 4 E 6 cm F 10 cm 6 cm 100°C 8m Determine the rate of heat transfer through the wall (in W).
An insulated steam pipe is covered with two layers of insulation as seen figure below. Draw the thermal resistance network. Develop a formula to calculate the heat transfer rate per unit length of the pipe. How can you determine the temperature difference AT across the pipe wall and second insulation layer. T, = 250°C. Ins.2 Ins. 1 Pipe r3 -T, = 20°C
I need the answer as soon as possible
Plate glass 5 mm thick at 200°C is to be cooled from both sides using air at 40°C. If surface cracks are to be avoided, determine the maximum value of convective heat transfer coefficient. Material properties are density = 2500 kg/m3, specific heat 670 J/kgK. Thermal conductivity 0.744 W/mk. Also determine the time required in this to cool the plate to 80°C.
A house has a composite wall of wood, fiberglass insulation, and plaster board, as indicated in the sketch. On a cold day, the temperature and the convection heat trans- fer coefficients are Tei=20°C, h;=30 W/m²K and Teo=-15°C, h, =60 W/m²K. The wall surface area is 350 m?. Determine the total heat loss through the wall. Conductivities are given as k,=0.038 W/m.K, k,=0.012 W/m.K, k,=0.17 W/m.K. Glass fiber blanket (28kg/m³), k, Plaster board, k, Plywood siding, k, 11 11 10mm 100mmH E20mm
A industial fireclay brick wall is contructed with 0.15 m thickness (K=1.7 W/m-K). The inner and outer surface temperatures are 1400K and 1150K, respectively. Calculate the heat loss in KW through the wall with a dimension of 0.5m by 1.2m.
The lining of box-type fumace is made up of a refractory layer and steel plate as shown in the figure. Steady state temperature at the surface of the refractory is 1273 K and that at the outer steel surface is 473 K. If the steady state heat flux through the refractory-steel plate composite is 1600 W/m², and heat flow is along x-direction only, the thermal contact resistance (m² K/W) between refractory and steel is_ steel Refractory 1273K Furnace 473K Ambient Given data: Thermal conductivity of refractory = 1.2 W/m-K Thickness of refractory lining = 80mm Thermal conductivity of steel = 32 W/mK Thickness of steel plate = 4mm
A block with thickness 2.3cm, and conductivity k-4W/mK is heated such that its temperature at its top is T₁-191°C Above the block, air at temperature Tair 22°C is blowing across the top which has a surface area of 1m² with heat transfer coefficient of 26W/m²K. air & W/mK T₁ T₂ What is the thermal resistance from T₂ to T? Provide total thermal resistance answer in units of K/W and to 4-decimal places