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The elemental unit of an air heater consists of a long circular rod of diameter D, which is encapsulated by a finned sleeve and in which thermal energy is generated by Ohmic heating. The N fins of thickness t and length L are integrally fabricated with the square sleeve of width w. Under steady-state operating conditions the rate of thermal energy generation corresponds to the rate of heat transfer to air flow over the sleeve.
(a) Under conditions for which a uniform surface temperature T, is maintained around the circumference of the heater and the temperature Too and convection coefficient h of the air flow are known obtain an expression for the rate of heat transfer per unit length to the air. Evaluate the heat rate for T1 = 300°C, D = 20 mm, an aluminum sleeve (k = 240 W/m · K), w = 40 mm, N = 16. t = 4 mm. L = 20 mm, T8 = 50°C, and h = 500 W/m2 · K.
(b) For the foregoing heat rate and a copper heater of thermal conductivity k h = 400 W/m · K, what is the required volumetric heat generation within the heater and its corresponding centerline temperature? (c) With all other quantities unchanged, explore the effect of variations in the fin parameters (N, L, t) on the heat rate, subject to the constraint that the fin thickness and the spacing between fins cannot be less than 2 mm.
A battery's lifetime was obtained as the time for the output to drop to 0.9 volt. The mean lifetime of these 152 batteries was 46.7 hours and the standard deviation was 13.3 hours. The industry standard for lifetime of such batteries is 45 hours.
Find the coefficients of reflection for fresh water (with relative permittivity equal to 81) of a vertically polarized wave that hits the water surface at an incident angle of 60o.
Given a system with input x(t) and output y(t) is described by the differential equation: d3y(t)/dt3 + 7d2y(t)/dt2 + 12dy(t)/dt = dx(t)/dt + 4x(t) a. Find the transfer function H(s) and the impulse response, h(t) where Y(s)=H(s)X(s) b. Find the respo..
A certain circuit is constructed with four elements inparallel: a 4 ohm resistor, a 10 ohms resistor, 1 uF capacitator,and a 2mH inductor. (a) compute α. (b) compute ω0 (c) is the circuit underdamped, critically damped oroverdamped Explain
A second-order system is being designed. It is desired that the percent overshoot be between 10 and 20 percent. Using the relationship between percent overshoot and damping ratio, this corresponds roughly to zeta being 0.45 and 0.6.
The carrier wave of frequency 100 MHz is frequency modulated by a sinusoidal wave of amplitude 20 V and frequency 100 kHz. The frequency sensitivity kf = 25 kHz/V. 1. Write expression for FM modulated wave s(t) if Ac = 1 V.
Finite Difference Time Domain (FDTD) numerical method to develop for me a software program that simulates - evaluates Specific Absorption Rate (SAR) Distribution in a Human Head Near a Mobile Cellular Phone as a student project.
Calculate the minimum number of PN bits required for each frequency hop for an FHSS system that employs a total bandwidth of 800 MHz and an individual channel bandwidth of 200 Hz.
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a) Determine the self inductance of coil 1, L11 b) Determine the self inductance of coil 2 L22 c) Determine the mutual inductance between the two coils, L12 or L21
An Aluminum wire with a square cross section 2mm on a side is carrying a current of 1.5amps. Aluminum has a resistivity of 2.69*10^-6 ohm-cm and an atomic volume of 10cc/mol. Assuming aluminum has three free electrons per atom
Implement the following boolean functions using a 3x8 decoder constructed with NAND gates and three external NAND or three external AND gates. F1(A,B,C) = m(2,4,7) F2(A,B,C) = m(0,3) F3(A,B,C) = m(0,2,3,4,7)
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