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
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
Name_Solution_
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
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