PIRA 4B50.00 HEAT TRANSFER APPLICATIONS

DCS #DEMONSTRATIONREFERENCEABSTRACT
4B50.00Heat Transfer Applications
4B50.10four thermos bottlesPIRA 500
4B50.10four thermos bottles4B50.10Monitor the temperatures of water in four thermos bottles with different combinations of vacuum and silvering.
4B50.10thermal properties of dewarsHd-3Temperatures are recorded for cooling of four thermos bottles of different construction.
4B50.10insulation (dewar flasks)Disc 14-26Hot water is placed in the four thermos bottles.
4B50.11bad dewarH-167Evacuate a unsilvered dewar, pour in liquid air, let air into the space, see frost form.
4B50.15four thermos bottles - LN2H-166Pour liquid air into four thermos bottles to sort out conduction, convection and radiation.
4B50.20boiling water in a paper cupPIRA 200Burn one paper cup, boil water in another.
4B50.20boil water in a paper cup4B50.20Fill a KFC bucket 1/8 full of water, boil the water with a Bunsen burner, and burn away the top part of the bucket with a propane torch.
4B50.20insulation with asbestosHd-4Fight asbestos abatement. Two identical cans of water, one wrapped with asbestos, cool.
4B50.20radiation from different surfaces38-5.1Three cans, black, asbestos covered, and shiny, are filled with boiling water and left to cool.
4B50.20surface radiationH-157An asbestos paper covered can cools faster than a shiny can.
4B50.20boil water in a paper cupH-147Boil water in a paper container.
4B50.20boiling water in a paper cupDisc 14-19Burn one paper cup, boil water in another.
4B50.25water balloon and matchesPIRA 1000
4B50.25balloon and matches4B50.25
4B50.25insulatorsH-127Show commercial insulating materials. Heat a penny red hot on your hand protected by 1/2" rock wool.
4B50.25water balloon heat capacityDisc 14-20Pop a balloon with a flame, then heat water in another balloon.
4B50.30Leydenfrost effectPIRA 1000
4B50.30Leyden frost phenomenomDisc 14-22Drop water on a hot plate, liquid nitrogen on the lecture table.
4B50.31spheroidal stateH-136A nugget of silver heated red and plunged into water does not cause immediate boiling.
4B50.32spheroidal stateH-134A drop of water suspended from a glass tube above a hot plate is stable until the plate cools.
4B50.32Leyden frost effectH-105Pour liquid air on your hand or roll it about on the top of your tongue.
4B50.33Leyden frost phenomenomAJP 46(8),825Four demonstrations: floating liquid drops on their own vapor, delayed quenching, Boutigny bomb, and stick your finger in boiling oil.
4B50.35finger in hot oilPIRA 1000
4B50.35finger in oil4B50.35Heat oil in a beaker, cut a potato and cook a french fry, then wet you finger in a beaker of water and stick it in the hot oil.
4B50.35spheroidal stateH-135A wet finger can be dipped into molten lead.
4B50.40reverse Leyden frostPIRA 1000
4B50.40reverse Leyden frost4B50.40
4B50.40reverse Leyden frost effectH-106Place a brass ball into liquid air in a clear dewar and observe the initial leidenfrost effect. When the ball is cold, place it in a flame and observe the reverse leidenfrost effect as frost forms on the ball while it is in the flame.
4B50.60greenhouse effectPIRA 1000
4B50.60greenhouse effectH-153The temperature of a closed bottle in direct sunlight is compared to the ambient temperature.
4B50.61greenhouse effect chamberAJP 41(3),443A chamber with interchangeable windows and provisions to introduce CO2.
4B50.62radiation and convectionH-165Put a hot metal object in a smoke filled projection cell and the smoke will be repelled by radiation pressure. Convection will cause an upward clearing.
4B50.70Davy lampHd-7A Bunsen burner will burn on top and bottom of two copper screens a few inches apart.
4B50.70Davy safety lampH-126Show that a Bunsen burner flame will not strike through to the other side of fine copper wire gauze. Direct a stream on gas at a lit Davy safety lamp.
4B50.80conduction and convection - PiraniH-146The basic principles of the Pirani vacuum gauge. Heat a platinum wire in a flask until it glows dull red, then evacuate the flask and the wire will glow more brightly at the same voltage.
4B50.90forced air calorimeterTPT 28(6),420Fans on either side of a 48 quart styrofoam cooler create a forced air calorimeter used in this example to measure the heat produced by a candle.

ReferenceDescription
M-1Sutton
Ma-1Freier & Anderson
M-1dHilton
8-2.8Meiners
1A12.01University of Minnesota Handbook
AJP 52(1),85American Journal of Physics
TPT 15(5),300The Physics Teacher
Disc 01-01The Video Encyclopedia of Physics Demonstrations

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