Radiative heat transfer. (1978)

Documentary №51774, 2 parts, duration: 0:17:49
Production: Centrnauchfilm (CNF)
Director:Marjyamov M.
Screenwriters:M.Marjyanov, A.Uspenskij
Other authors:E.V.Balohoncev


Educational film for students. Showing the latest industrial and laboratory settings.

Reel №1

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The sun as a source of radiant energy.

Cyclists are riding on the road.

Shooting cyclists in infrared rays.

The movement of the mouse on the thermal imager screen.

Stills from the film "Hyperboloid engineer Garin".

A solar installation that converts solar energy into thermal energy.

On the thermal imager screen, warm water is poured into a cup, the cup heats up.

An old engraving of a man heating water with a hot stone.

Today's ideas about the theory of radiant exchange are laid down in the works of John Herschel.

Herschel discovered that the solar spectrum contains radiation invisible to man.

In the works of Gustav Kirchgov, who established the relationship between the radiative and absorbing abilities of the body.

In the works of Boltzmann Ludwig and Max Planck.

Conditional image of radiant exchange.

A cartoon characterizing the emissivity of the body.

In the cartoon, there is a graph of the emissivity of a body close to absolutely black.

The graph is located in the coordinate system of the radiation intensity depending on the wavelength.

A cartoon characterizing the absorption capacity of the body.

The greater the emissivity of the body, the greater its absorption capacity.

Transparent quartz weakly absorbs radiation compared to steel.

When the steel spring already has a red-cherry gorenje, the quartz rod does not glow.

The addition of rare earth elements in quartz crystals leads to

to wide absorption bands.

The radiation spectrum of such quartz when heated.

A cartoon characterizing absolutely black bodies and their radiation.

Conditional image of radiation quanta.

Absolutely black bodies do not exist.

Substances with a large absorption coefficient in a limited range of the spectrum are close to gray bodies.

A cartoon explaining the reasons for the change in the degree of absorption and radiation of materials.

Key words



Dzhon Gershelj, fizik. Gustav Kirhgov, fizik. Boljcman Lyudvig, fizik. Maks Plank, fizik.

Calendar: 1978

Reel №2

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Changes in the absorption and radiation of materials depend on the internal structure of the body.

Flaw detectors are based on this principle.

The process of searching for shells and cracks in semiconductor crystals.

Demonstration of various properties of thermal radiation.

Richie's device.

The Krugs radiometer.

Experience with a cup covered with a pattern.

If you place the cup inside a closed cavity with a high temperature, the pattern will no longer be visible.

The drawing is visible again on the removed cup.

Rods of chalk and graphite are put in the oven.

Chalk looks black and graphite looks white.

A device for non-destructive testing of bodies heated to a high temperature.

This device allows you to monitor the temperature distribution in the sample and its change.

Reproduction of a thermal portrait of a person using a liquid crystal film.

When testing samples for bending and torsion, the thermal imager allows measuring the dynamics of the thermal process up to tenths of a degree.

The temperature distribution in the sample allows you to anticipate the fracture site.

The thermal imager allows you to register the temperature of a person's skin and determine various diseases in a timely manner.

Photographing the planet in infrared rays allows you to record the thermal radiation of the surface.

Get data on the state of vegetation cover, the degree of pollution of the world ocean, and natural resources.

The dispatcher of the CHP.

Boiler furnaces.

The emission of combustion products is of great importance here.

Carbon dioxide and water vapor have such a high temperature that heat transfer from them takes place in the form of radiant heat exchange.

Builders and designers need to solve the issues of protecting people and equipment using thermal insulation materials and reflective screens.

Investigation of powerful radiation fluxes on materials.

Verification of the suitability of materials for use in space programs.

The powerful radiation of the sun and the reflected radiation of the planet fall on the satellite, so the surface of the satellite is covered with well-reflecting radiation coatings.


Key words

Heat exchange.
Applied use.

Calendar: 1978

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