c. Short answer You need to calculate the temperature at the free end (tip) of a long fin. The boundary condition you should NOT use is: Circle one! Convective tip Adiabatic tip Infinite fin d. Multiple choice For the most effective fin, should the fin material have: Circle one! (k is thermal conductivity, h is convection coefficient) 1. Large h, Large k 2. Large h, Small k 3. Small h. Large k 4. Small h, Small k

c. Short answer You need to calculate the temperature at the free end (tip) of a long fin. The boundary condition you should NOT use is: Circle one! Convective tip Adiabatic tip Infinite fin d. Multiple choice For the most effective fin, should the fin material have: Circle one! (k is thermal conductivity, h is convection coefficient) 1. Large h, Large k 2. Large h, Small k 3. Small h. Large k 4. Small h, Small k

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.63P: 1.63 Liquid oxygen (LOX) for the space shuttle is stored at 90 K prior to launch in a spherical...

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1.63 Liquid oxygen (LOX) for the space shuttle is stored at 90 K prior to launch in a spherical container 4 m in diameter. To reduce the loss of oxygen, the sphere is insulated with superinsulation developed at the U.S. National Institute of Standards and Technology's Cryogenic Division; the superinsulation has an effective thermal conductivity of 0.00012 W/m K. If the outside temperature is on the average and the LOX has a heat of vaporization of 213 J/g, calculate the thickness of insulation required to keep the LOX evaporation rate below 200 g/h.
1.3 A furnace wall is to be constructed of brick having standard dimensions of Two kinds of material are available. One has a maximum usable temperature of 1040°C and a thermal conductivity of 1.7 W/(m K), and the other has a maximum temperature limit of 870°C and a thermal conductivity of 0.85 W/(m K). The bricks have the same cost and are laid in any manner, but we wish to design the most economical wall for a furnace with a temperature of 1040°C on the hot side and 200°C on the cold side. If the maximum amount of heat transfer permissible is 950 , determine the most economical arrangement using the available bricks.
Find the heat loss from the fin, answer in MS WORD not in paper please its urgent
Consider a steel alloy plate that is 10 ft long and 6 ft wide and is insulated on its flat surfaces. Suppose that left edge is maintained at 1000 °F and the other three edges are all maintained at 50°F. Solve for the temperature profile. Please show complete solution.
A mechanic needs to remove a tight fitting pin of material A from a hole in a block made of material B. The machinist heats both the pin and the block to the same high temperature and removes the pin easily. What statement relates the coefficient of thermal expansion of material A to that of material B?
You are designing a small heatsink to cool a high-powered IC on a control unit PCB. The IC puts out 40,000 W/m2 and has a size of 40mm x 20mm. A fan blows 40 degrees C air across the IC at a speed of 4 m/s. The IC is well insulated on its back face. If the convection coefficient is 62 W/m2K, what is the surface temperature of the IC?
Presents the diagram of the problem, necessary formulas, clearance and numerical solution: A metal plate 4 mm thick has a temperature difference between its two faces of 32 ◦C. It transmits 200 kcal/h through an area of 5 cm2. Calculate the thermal conductivity of the metal in W/m K.
Two bars A and B, each of length 2m and cross sectional area 1m^2, are placed end to end. Their thermal conductivities are kA = 339 W/mK and kB = 837 W/mK . The left end of bar A is maintained at 373 K while the right end of B is maintained at 273 K. What is the temperature at the interface between A and B?
Q3. What is the analogical reason between heat transfer by conduction and flow of electricity through ohmic resistance? Use a composite wall of a building to illustrate the concept. A composite slab with three layers of thermal conductivities k1, k2, k3 and thickness t1, t2, t3 respectively, are placed in a close contact. Derive an expression from the first principle for the heat flow through the composite slab per unit surface area in terms of the overall temperature difference across the slab.
Sputnik 1, the first satellite launched into space by the Russians in 1957, is a 2-shell aluminum alloy (2024-T6) sphere. The highly polished outer shell (seeing deep space) is 585 mm in diameter, and has thickness of 1 mm (ID = 583 mm). The inside shell is 2 mm thick. There is a contact resistance between the two aluminum shells of value Rc"= 200 m2·K/W. Inside the shell, there is a radio unit that is uniformly dissipating thermal energy of Qradio = 1 W. Determine the steady-state temperature on the inner shell’s inner wall (ignore the effects of the antennas). Hint: You can use a radiation heat transfer coefficient hr = εσTshell3
How long must a 0.4 cm cylindrical copper fin be if the temperature of its insulated tip exceeds thesurrounding air temperature by 20% of T0 – T∞? Consider air temp to be 20°C and ℎ̅ = 28 W/m2K. Book gives answerof 27.3 cm.• You can use figure 4.9a or equation 4.45 in the book to find the right mL for the desired  at the tip. • Recall the nondimensional temperature is  = (T – T∞)/(T0 – T∞)
(a) The temperature at the surface of the heating rod, T1. (b) If the salt solution temperature is 300 degree Celcius, what is the value of convection heat transfer coefficient, h of the salt solution ? (c) If the heating rod is not covered by metallic cylinder and corresponds to the result of part (a) and (b), how much the rate of energy transfer to the salt solution ? (d) Compare and discuss the difference of heat transfer with and without the matallic cylinder.