KNOWN: The temperature-time history of a pure copper sphere in an air stream.
FIND: The heat transfer coefficient between the sphere and the air stream.
ASSUMPTIONS: (1) Temperature of sphere is spatially uniform, (2) Negligible rad
KNOWN: Flow rate and properties of oil flowing in pipe. Dimensions of pipe.
FIND: Pressure drop, flow work, temperature rise caused by flow work.
L = 100 km
m = 500 kg/s
= 900 kg/m3
cp = 2000 J/kgK
D = 1.2 m
KNOWN: Thermal energy equation describing laminar, fully developed flow in a circular pipe with
FIND: (a) Left hand side of equation integrated over the pipe volume, (b) viscous dissipation term
integrated over the same v
KNOWN: Speed and temperature of atmospheric air flowing over a flat plate of prescribed
length and temperature.
FIND: Rate of heat transfer corresponding to Rex,c = 10 , 5 10 and 10 .
ASSUMPTIONS: (1) Flow over top and bottom
KNOWN: Flat plate comprised of rectangular modules of surface temperature Ts, thickness a and
length b cooled by air at 25C and a velocity of 30 m/s. Prescribed thermophysical properties of the
FIND: (a) Required power generat
KNOWN: Parallel flow over a flat plate and two locations representing a short span x1 to x2
where (x2 - x1) < L.
FIND: Three different expressions for the average heat transfer coefficient over the short
span x1 to x2, h1 2 .
KNOWN: Form of velocity profile for flow over a flat plate.
FIND: (a) Expression for profile in terms of u and , (b) Expression for (x), (c) Expression for
ASSUMPTIONS: (1) Steady state conditions, (2) Constant properties, (3)
KNOWN: Velocity and temperature profiles and shear stress-boundary layer thickness
relation for turbulent flow over a flat plate.
FIND: (a) Expressions for hydrodynamic boundary layer thickness and average friction
coefficient, (b) Expressions
KNOWN: Liquid metal in parallel flow over a flat plate.
FIND: An expression for the local Nusselt number.
ASSUMPTIONS: (1) Steady, incompressible flow, (2) < t, hence u(y) u, (3) Boundary layer
approximations are valid, (4) Constant
KNOWN: Velocity and temperature of air in parallel flow over a flat plate.
FIND: (a) Velocity boundary layer thickness at selected stations. Distance at which boundary layers
merge for plates separated by H = 3 mm. (b) Surface shear stress and
KNOWN: Temperature and velocity of fluids in parallel flow over a flat plate.
FIND: (a) Velocity and thermal boundary layer thicknesses at a prescribed distance from the leading
edge, and (b) For each fluid plot the boundary layer thicknesses
KNOWN: Dimensions and surface temperature of electrically heated strips. Temperature and velocity
of air in parallel flow.
FIND: (a) Rate of convection heat transfer from first, fifth and tenth strips as well as from all the strips,
(b) For ai
KNOWN: Temperature and velocity of engine oil. Temperature and length of flat plate.
FIND: (a) Velocity and thermal boundary layer thickness at trailing edge, (b) Heat flux and surface shear
stress at trailing edge, (c) Total drag force and he
Examples of Kinematic Computations in MATLAB
This short tutorial, given in terms of a series of examples, is intended to get you a quick
start on using MALTAB to perform kinematic computations and plotting in MATLAB.
You can always type hel
Trabalho de Filosofia
Luclia Oliveira Muniz
Victor Pereira Araujo
Werik Borges Teixeira
Raisleny Alves da Silva
Immanuel Kant (Knigsberg, 22 de abril de 1724 Knigsberg, 12 de fevereiro de
1804) foi um filsofo prussiano. Amplamen
KNOWN: Velocity and temperature profiles for laminar flow in a parallel plate channel.
FIND: Mean velocity, um, and mean (or bulk) temperature, Tm, at this axial position. Plot the velocity
and temperature distributions. Comment on whether val
KNOWN: Water, engine oil and NaK flowing in a 20 mm diameter tube, temperature of the
FIND: (a) The mean velocity as well as hydrodynamic and thermal entrance lengths, for a flow
rate of 0.01 kg/s and mean temperature of 366 K, (b) The
KNOWN: Velocity and temperature profiles for laminar flow in a tube of radius ro = 10 mm.
FIND: Mean (or bulk) temperature, Tm, at this axial position.
ASSUMPTIONS: (1) Laminar incompressible flow, (2) Constant properties.
KNOWN: Thickness and properties of flaked food product. Conveyor length. Initial flake
temperature. Ambient temperature and convection heat transfer coefficient. Final product temperature.
FIND: Required conveyor velocities for thick and thin
KNOWN: Solid steel sphere (AISI 1010), coated with dielectric layer of prescribed thickness and
thermal conductivity. Coated sphere, initially at uniform temperature, is suddenly quenched in an oil
FIND: Time required for sphere to reach
KNOWN: Diameter and initial temperature of steel balls cooling in air.
FIND: Time required to cool to a prescribed temperature.
ASSUMPTIONS: (1) Negligible radiation effects, (2) Constant properties.
ANALYSIS: Applying Eq. 5.10 to a
KNOWN: Diameter and initial temperature of steel balls in air. Expression for the air
temperature versus time.
FIND: (a) Expression for the sphere temperature, T(t), (b) Graph of T(t) and explanation of
D = 0.012 m
KNOWN: Geometries of various objects. Material and/or properties. Cases (a) through (d):
Convection heat transfer coefficient between object and surrounding fluid. Case (e): Emissivity of
sphere, initial temperature, and temperature of surroun
KNOWN: Plane wall whose inner surface is insulated and outer surface is exposed to an
airstream at T. Initially, the wall is at a uniform temperature equal to that of the airstream.
Suddenly, a radiant source is switched on applying a uniform
KNOWN: Microwave and radiant heating conditions for a slab of beef.
FIND: Sketch temperature distributions at specific times during heating and cooling.
ASSUMPTIONS: (1) One-dimensional conduction in x, (2) Uniform internal heat
KNOWN: Plate initially at a uniform temperature Ti is suddenly subjected to convection
process (T,h) on both surfaces. After elapsed time to, plate is insulated on both surfaces.
FIND: (a) Assuming Bi > 1, sketch on T - x coordinates: initial
KNOWN: Electrical heater attached to backside of plate while front surface is exposed to
convection process (T,h); initially plate is at a uniform temperature of the ambient air and
suddenly heater power is switched on providing a constant q .
KNOWN: Flowrate and temperature of water in fully developed flow through a tube of
FIND: Maximum velocity and pressure gradient.
ASSUMPTIONS: (1) Steady-state conditions, (2) Isothermal flow, (3) Horizontal tube
KNOWN: Temperature and mean velocity of water flow through a cast iron pipe of
prescribed length and diameter.
FIND: Pressure drop.
ASSUMPTIONS: (1) Steady-state conditions, (2) Fully developed flow, (3) Constant
KNOWN: Temperature and velocity of water flow in a pipe of prescribed dimensions.
FIND: Pressure drop and pump power requirement for (a) a smooth pipe, (b) a cast iron pipe with a clean
surface, and (c) smooth pipe for a range of mean velociti