A tube-launched rocket has stabilizing fins at its rear. During launch the fins experience hot gas at Tg = 1700 oC for a time t = 0.3 seconds. It is important that the fins survive launch without surface melting, T. Given the heat transfer coefficient is h, the heat flux per unit area is q=h(Tg-Ts). What is the objective for this design? High melting point Low thermal conductivity Launching efficiency Low melting point

A tube-launched rocket has stabilizing fins at its rear. During launch the fins experience hot gas at Tg = 1700 oC for a time t = 0.3 seconds. It is important that the fins survive launch without surface melting, T. Given the heat transfer coefficient is h, the heat flux per unit area is q=h(Tg-Ts). What is the objective for this design? High melting point Low thermal conductivity Launching efficiency Low melting point

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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1. A composite furnace wall is made up of a 12-in. lining of magnesite refractory brick, a 5-in.thickness of 85% magnesia, and a steel casing 0.10-in. thick. Flue gas temperature is 2200 F andthe boiler room is at 80 F. Gas side film coefficient is 15 Btu/hr-sq.ft-F and air side is 4.0.Determine:a. The thermal current Q/Ab. Interface temperaturesc. Effect on thermal current and inside refractory wall temperature if the magnesia insulation weredoubled.
sub-parts solved.
For the given values, determine the efficiency of the fin? Air, 25°C h = 154 W/m2 K %3D T 350°C t1=5 mm k= 235 W/m-K w = 100 mm L= 50 mm
Problem 2: G10 is a popular grade of fiberglass used in PCBS and aerospace applications. Given the figure below, what is the heat rate through the fiberglass plate, if the fiberglass is 1m H x 2m W x 0.1m thick? T1 T2 T01 = 80°C W h = 38- T02 = 25°C W h2 = 20- G10 Fiberglass m²K m²K
REFERENCE: FROM BOOK - ENGINEERING THERMOFLUIDS, M. MASSOUD
(2.23) A finned heat exchanger tube is made of aluminum alloy (k = 186 W/m · K) and contains 125 annular fins per meter of tube length. The bare tube between fins has an OD of 50 mm. The fins are 4 mm thick and extend 15 mm beyond the external surface of the tube. The outer surface of the tube will be at 200°C and the tube will be exposed to a fluid at 20°C with a heat-transfer coefficient of 40 W/m2 · K. Calculate: (a) The rate of heat transfer per meter of tube length for a plain (un-finned) tube. (b) The fin efficiency. (c) The fin and prime surface areas per meter of tube length. (d) The weighted efficiency of the finned surface. (e) The rate of heat transfer per meter of tube length for a finned tube. (f) If the cost per unit length of finned tubing is 25% greater than for plain tubing, determine whether plain or finned tubing is more economical for this service. %3D Ans. (a) 1130 W. (b) 98.6%. (c) 0.8946 m? and 0.07854 m². (d) 98.7%. (e) 6920 W.
Task 01 An industrial freezer is designed to operate with an internal air temperature of -20 0C when the external air temperature is 25 0C and the internal and external heat transfer coefficients are 12 W/m2K and 8 W/m2K , respectively. The walls of the freezer are composite construction, comprising of an inner layer of plastic ( k=1 W/m.K , and the thickness of 3 mm) , and an outer layer of stainless steel (k=16 W/m.K , and thickness of 1mm). Sandwiched between these two layers is a layer of insulation material with k=0.07 W/m.K and the thickness of 195mm. Find the overall heat transfer coefficient and determine the heat transfer through the industrial freezer.
In a cylindrical fuel element for a gas-cooled nuclear reactor, the heat generation rate within the fuel element due to fission can be approximated by the relation: g(r) = g_0 [1 - (r/b)^2] W/m^3 where b is the radius of the fuel element and g_0 is constant. The boundary surface at r = b is maintained at a uniform temperature T_0. Assuming one-dimensional, steady-state heat flow, develop a relation for the temperature drop from the centerline to the surface of the fuel element. For radius b = 2 cm, the thermal conductivity k = 10 W/m middot K and g_0 = 2 times 10^7 W/m^3, calculate the temperature drop from the centerline to the surface.
Find the rate of heat transfer if the cylinder in a stainless steel rod.k = 15 W/m·K (8.7 Btu/h·ft·F), L = 1 m (3.3 ft), Th = 200 C (392 F), Tc= 100 C(212 F), A = 5 cm2 (0.8 in2).
Estimate the volume of your kitchen oven and guess how many Watts it takes to pre-heat the air in your oven from 22 °C (72° F) to 221 °C (~430° F)? If the amount of steel that is heated in the inside of the oven totals 3 kg, how many Watts additionally does it take to pre-heat that? Time your oven to preheat and estimate the average Q needed.
Please include free body diagram and please don't type
40 mm h=12 W /m K mm 3 mm Toplam 9 kanatçık k; 175 W/m.K T, = 60°C In a way to cool an electronic circuit element The supplied aluminum wings are used. Base temperature 60 o C and ambient temperature 20 o c dir. From the wing tip if the heat transfer is neglected calculate total heat transfer, blade efficiency and blade effectiveness. calculatel ww os