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mae lab2
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Gravity
Key Concepts:
Terms in this set (31)
the two sphere material are
aluminum and brass
we boil sphere until they reach what temp
100C
the graph should be displaying
room temperature and sphere temperature
how do you ensure that the thermocouples are connected correctly?
record temperature data as soon as the stove is on
how do you make the top off the wind tunnel
use a metal key
what does closing the top of the wind tunnel do?
ensures no loss in power
when you are doing forced convection. you are setting wind tunnel to ___ flow
max
the computer should graph ___ vs ___
sphere temp vs time
when doing natural convection, whats the difference from forced?
you place it in stagnant air to cool by natural convection
how many runs do you do in the experiment
6
what are you supposed to show to the TA at the end of lab?
log (T - Troom) vs log(time - time0)
Heat- type of energy is in [units]
J
at micro-scale: gas are particles
of random movement
at micro-scale: solids aer
oscillations or electron movement
kinetic energy is due to
particle movement (transferred through collision)
___ is required for conduction and convection
contacting
formula to measure heat transfer coefficient h
Q = h(Ts -T)A
how to measure heat transfer coefficient
1. use formula 2. apply transient analysis
natural conv h based on v
v = 0
forced conv h based on v
v < > 0
what is the energy balance equation
change rate of thermal energy = heat loss rate at surface
what are the three modes of heat transfer
conduction, convection, radiation
difference between natural and forced convection in terms of external forces
natural has no external forces. forced has external forces that cause the fluid to flow
any auction of dissimilar metals will produce an electrical potential related to
temperature
the lumped capacitance analysis has the formula of
Bi = hLc/k (requires Bi << 1)
if Bi > 1 the rate of thermal energy change becomes
an integral
under the low Biot number assume, thermal conductivity of sphere is high/low and temperature decay is ___ throughout the sphere
high, uniform
the time rate of temperature decay is controlled by ___ from surface of sphere
heat transfer coefficient (determined from temperature time data)
simplification can be made if material of sphere has a high thermal conductivity aka
sphere cools or warms without internal temperature gradients (lumped capacitance model)
heat transfer coefficient depends on a function of
fluid, shape, and the flow itself
temp everywhere inside of cooling sphere is predicted to fall ____ with time
exponentially
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