A fluid is flowing in a tube with a thermal conductivity = 14.4 W/ m.K, it's inner diameter is 24 mm and the wall thickness 2 mm. The corresponding inner and outer convection coefficients are 400 and 10 W/ m2.K. Then the inner thermal convection resistance is: Select one: a. None of the mentioned b. 1.7 m.K/W c. 0.033 m.K/ W d. 1.136 m. K/ W e. 2.262 m.K/ W

A fluid is flowing in a tube with a thermal conductivity = 14.4 W/ m.K, it's inner diameter is 24 mm and the wall thickness 2 mm. The corresponding inner and outer convection coefficients are 400 and 10 W/ m2.K. Then the inner thermal convection resistance is: Select one: a. None of the mentioned b. 1.7 m.K/W c. 0.033 m.K/ W d. 1.136 m. K/ W e. 2.262 m.K/ W

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

Q. Steam in a heating system flows through tubes whose outer diameter is 5 cm and whose walls are maintained at a temperature of 130 °C. Circular aluminum alloy 2024-T6 fins k = 186 W/m.K of outer diameter 6 cm and constant thickness 1 mm are attached to the tube. The space between the fins is 3 mm, and thus there are 250 fins per length of the tube. Heat is transferred to the surrounding air at 25 °C, with a heat transfer coefficient of 40W/m².K. Determine: 1. The increase in heat transfer from the tube per meter of its length as result of adding fins. 2. The efficiency of the fins. 3. Temperature at mid-point of the fins. Note: Equations and any other data required can be taken from textbook/handbook. 130°C 25°C
2.) A 30 ft copper pipe is 1.5 ft in diameter and has a thickness of 2 in. It has an internal temperature of 85F and an external temperature of 70F. Solve for k if the rate of heat transfer is 2.6 x 106 Btu hr
A steam pipe with outside diameter 10 mm, passes through a room, the surface temperature of the pipe is 100 °C and the air is at 25 °C. Convection coefficient is 15 W/ m2.K. The heat transfer from a tube of length 5 m is: Select one: a. 1767 W b. 1767 W/ m c. 1767 W /m2 d. 176 W e. 1765 W
A plane wall has internal heat generation and is cooled covectively at its two faces. Given : A) heat generation ate g1,000W /m? 2L 100 mm wall thickness T- 20C air temp temp within wall T(x)=10(0.05'-x')+30 W Im.K Al) Find thermal conductivity of the wall k WIm'.K A2) Find convection heat transfer coeff
A wall has an area of 10 m2, its thickness is 30 cm, its thermal conductivity is 0.1 W/m. k, then the unit thermal resistance is: Select one: O a. 3 m2 k/W O b. 3 k/W O c. 0.3 m2 k/W O d. 0.3 W/k O e. none of the mentioned
An office space of 14 ft x114 ft x12 ft height. The heat loss through roof is (5131.3 Btuh) if Tb.l.=70 F, To= 5 F , and Uwall=0.35 Btu/hr.ft2.F * O True O False
105 W/m3 heat is uniformly generating within a 4 cm thick slab. The slab is exposed to ho = 10 W/m2K and To = 20 °C ambient conditions from its both sides. What is the surface temperature of the slab? A. 420 °C B. 200 °C C. 220 °C D. 100 °C
S is 6. A spherical shaped vessel of 1.4 m outer diameter is 90 mm thick. Find the rate of heat leakage, if the temperature difference between the inner and outer surfaces is 220°C. Thermal conductivity of the material of the sphere is 0.083 W/mK. (a) 0.2 kW (c) 1.088 kW (b) 0.5 kW (d) 1.6 kW
Q₁: Find the heat transfer rate by adding straight fins of rectangular cross section of length 50 mm and thickness of 0.5 mm when the heat transfer coefficient from the surface is 40 W/m K and for the fins is 30 W/m°K and k=900 W/m K, surface area (1x1) and distance fins 4 mm. Ans 51526.25
Q) The temperature of a heated plate is 88°C which is cooled by using pin-fins having a length of 5-cm, diameter of 1-cm, and thermal conductivity of (k=201 W/m-°C). The number of pins is (N=1800) and the temperature of the atmosphere is 10°C, while the convection heat transfer coefficient on the surfaces is 37 W/m2.°C. Assuming steady one-dimensional heat transfer along the fin and taking the nodal spacing to be 2.5-cm, determine (a) the temperature at the nodes along the fins, (b) the heat transfer rate from a single fin, (c) the heat transfer rate from all fins, and (d) the overall heat transfer rate from the heated plate which has dimensions of 0.6-m x 0.5-m with the fins.
A finned surface has been added to cool an electronic part. The surface temperature of the electronic part in contact with the fins is 60 ° C, the convection coefficient between the environment and the finned surface is 40 W / m? .K and the thermal conductivity coefficient for the fin material (aluminum) is 180 W / m.K. a. The amount of Heat (W) per unit time thrown into the environment in case the electronic part has wings or no blades, b. Find out wing effectiveness and efficiency?