Homework #2
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Problem 1. Starting with an energy balance on a volume element, derive the two dimensional transient heat conduction equation in rectangular coordinates for T(x, y, t) for the case of constant thermal conductivity with heat gene
Seung Yeon Joo
HW5
ME 109
Problem 2.66
Problem Statement: Consider a solid cylindrical rod of length 0.15 m and diameter 0.05 m. The
top and bottom surfaces of the rod are maintained at constant temperatures of 20C and 95C,
respectively, while the side su
Homework #5
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Problem I. The temperature of a gas stream is to be measured by a thermocouple whose junction can be approximated as a 1.2-mm-diameter sphere. The properties of the junction are k=35 W/m0C, =8500 kg/m3, and CP= 320 J/kg0C, and the heat
Homework #3
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Problem 1. A 1.5 kW resistance heater wire whose thermal conductivity is k = 10.4 BTU/hft0F has a radius of r0 = 0.06 in. and a length of L = 15 in., and is used for space heating. Assuming constant thermal conductivity and oned
CHE/ME 109
Homework Assignment 1 Chapter 1 (1.1-1.5)
Problem 1. A computer has vent holes on opposite sides and a fan installed in the computer provides a flow of air with a constant mass flow rate into and out of the computer of 15 g/minute. Electronic c
CHE/ME 109 Homework #9
Name_ glass bulb - 0.5 mm thick glass
0.6 cm 6 cm
filament - 1 mm diameter
Problem I. Halogen lamps have bulbs with a glass cylinder 0.7 cm in diameter x 6 cm long. A filament inside the glass cylinder is coiled tightly to create an
ME/CHE 109 Homework #8
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Problem I. Natural Convection in cylindrical enclosure
A simple solar collector is built by placing a 5-cm-diameter clear plastic tube around a garden hose whose outer diameter is 1.4 cm. The hose is painted black to maximize
Problem 3.
A 0.1-W small cylindrical resistor mounted on a lower part of a vertical circuit board is 0.75 cm long and has a diameter of 0.5 cm. The view of the resistor is largely blocked by another circuit board facing it, and the heat transfer through t
CHE/ME 109 Homework 6 15 cm air 500C 5 m/s
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15 W
Problem I. A 15 x 15-cm circuit board dissipating 15 W of power uniformly is cooled by air, which approaches the circuit board at 500C with a velocity of 5 m/s. Flow across the circuit board i