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Science
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Mechanical Engineering
Heat and Heat Technology - Chapter 6
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Gravity
Ch 6 Forces, Motion and Energy textbook - Heat Energy Chapter 6
Terms in this set (21)
energy that moves particles in matter
thermal energy
what we feel as heat is thermal
energy
matter with slow moving particles is
cold
movement of particles from one place to another
heat
heat that moves between objects that touch each other
conduction
material in which thermal energy moves through easily
conductor
material that thermal energy can not easily move through
insulator
heat that moves through liquids & gases
convection
heat that moves through space from the Sun to Earth
radiation
thermal energy that moves without touching anything
radiation
a tool for measuring heat
thermometer
2 scales for measuring temperature
Fahrenheit & Celsius
Temperature
a measure of the average kinetic energy of the particles in an object
Thermal expansion
an increase in the size of a substance in response to an increase in the temperature of it
absolute zero
the temperature at which molecular energy is at a minimum
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Verified questions
ENGINEERING
Water enters a tube at $27^{\circ} \mathrm{C}$ with a flow rate of 450 kg/h. The heat transfer from the tube wall to the fluid is given as $q_{s}^{\prime}(\mathrm{W} / \mathrm{m})=a x$, where the coefficient a is $20 \mathrm{W} / \mathrm{m}^{2}$ and x (m) is the axial distance from the tube entrance. (a) Beginning with a properly defined differential control volume in the tube, derive an expression for the temperature distribution $T_{m}(x)$ of the water. (b) What is the outlet temperature of the water for a heated section 30 m long? (c) Sketch the mean fluid temperature, $T_{m}(x)$, and the tube wall temperature, $T_{s}(x)$, as a function of distance along the tube for fully developed and developing flow conditions. (d) What value of a uniform wall heat flux, $q_{s}^{\prime \prime}$ (instead of $\left.q_{s}^{\prime}=a x\right)$, would provide the same fluid outlet temperature as that determined in part (b)? For this type of heating, sketch the temperature distributions requested in part (c).
ENGINEERING
A steady-flow combustion chamber is supplied with CO gas at $37^{\circ} \mathrm{C}$ and 110 kPa at a rate of $0.4\ \mathrm{m}^{3} / \mathrm{min}$ and air at $25^{\circ} \mathrm{C}$ and 110 kPa at a rate of 1.5 kg/min. The combustion products leave the combustion chamber at 900 K. Assuming combustion is complete, determine the rate of heat transfer from the combustion chamber.
ENGINEERING
An abc-sequence balanced three-phase wye-connected source supplies power to a balanced wye-connected load. The line impedance per phase is $1+j 5 \Omega$, and the load impedance per phase is $25+j 25 \Omega$. If the source line voltage $\mathbf{V}_{a b}=208 \angle 0^{\circ} \mathrm{V}$ rms, find the line currents.
ENGINEERING
The weight of a diesel engine is directly proportional to the compression ratio (W = kr) because extra metal must be used to strengthen the engine for the higher pressures. Examine the net specific work produced by a diesel engine per unit of weight as the pressure ratio is varied and the specific heat input remains fixed. Do this for several heat inputs and proportionality constants k. Are there any optimal combinations of k and specific heat inputs?
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