Understanding Heat Transfer, Conduction, Convection and Radiation

Conduction is heat transfer through matter by touching Metals conduct heat well Air is not as good a conductor of heat This is a direct contact type of heat transfer The only air heated by the Earth is the air at the Earth’s surface As a means of heat transfer, conduction is the least significant with regard to heating the Earth’s

Heat Transfer: Conduction, Convection, and Radiation

Conduction is how heat travels between objects that are touching Conduction travels fastest through solids, but liquids and gases can also conduct heat Some materials, like metal, can conduct heat very quickly, while other materials (like plastic or wood) conduct heat very slowly Convection is how heat travels through fluids – liquids and

Conduction in the Cylindrical Geometry - Clarkson University

profile in steady conduction As anexample , recall that the steady temperature profile for one-dimensional conduction in a rectangular slab is a straight line, provided the thermal conductivity is a constant In the cylindrical geometry, we find the steady temperature profile to be logarithmic in the radial coordinate in an analogous situation

Conduction, Convection, & Radiation

Conduction •Heat traveling through solids •Two objects must touch or have direct contact •As molecules heat up they move faster and expand •When you touch one hot surface to another, the hot molecules bump into the other molecules which makes them start to move faster •An object gets hotter from the movement of the molecules

Anatomy of the conduction system - Brown University

II CONDUCTION SYSTEM ANATOMY The functions of the electrical system of the heart (Fig II-1) are not only initiation and rate of the heartbeat, but its coordinated transmission to the entire heart resulting in maximum mechanical efficiency Anatomy of the conduction system Sinus Node AV Node right ventricle left ventricle left atrium right atrium

Understanding Heat Transfer, Conduction, Convection and Radiation

Conduction When you heat a metal strip at one end, the heat travels to the other end As you heat the metal, the particles vibrate, these vibrations make the adjacent particles vibrate, and so on and so on, the vibrations are passed along the metal and so is the heat We call this? Conduction

Lecture 39 - Review of Conduction

1 HEAT CONDUCTION - Elseviercom

1/6 HEAT CONDUCTION x y q 45° 1 3 The Heat Conduction Equation The solution of problems involving heat conduction in solids can, in principle, be reduced to the solution of a single differential equation, the heat conduction equation The equation can be derived by making a thermal energy balance on a differential volume element in the solid

Basic Nerve Conduction Studies - AANEM

Conduction velocity: speed; can be affected by both axonal loss and demyelination Large, fast conducting fibers are lost Moderate slowing

Upper and Lower Extremity Nerve Conduction Studies

Oct 18, 2019 · Nerve Conduction Studies Kelly G Gwathmey October 18, 2019 Virginia Commonwealth University 2019 Financial Disclosure

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Understanding Heat Transfer,

Conduction, Convection and

Radiation

Heat Transfer

Heat always moves from a warmer place to

a cooler place.

Hot objects in a cooler room will cool to

room temperature.

Cold objects in a warmer room will heat up

to room temperature.

Question

If a cup of coffee and a red popsickle were

left on the table in this room what would happen to them? Why?

The cup of coffee will cool until it reaches

room temperature. The popsickle will melt and then the liquid will warm to room temperature.

Heat Transfer Methods

Heat transfers in three ways:

Conduction

Convection

Radiation

Conduction

When you heat a metal strip at one end, the heat

travels to the other end. As you heat the metal, the particles vibrate, these vibrations make the adjacent particles vibrate, and so on and so on, the vibrations are passed along the metal and so is the heat. We call this? Conduction

Metals are different

The outer e______ of metal atoms

drift, and are free to move.

When the metal is

energy and transfer it throughout the metal.

Insulators, such as w_ and p__, do not

do not conduct heat as well as metals. lectrons inetic ood lastic

Why does metal feel colder than wood, if they

are both at the same temperature?

Metal is a conductor, wood is an insulator. Metal

conducts the heat away from your hands. Wood does not conduct the heat away from your hands as well as the metal, so the wood feels warmer than the metal.

Convection

What happens to the particles in a liquid or a

gas when you heat them?

The particles spread out and

become less dense.

This effects fluid movement.

What is a fluid? A liquid or gas.

Fluid movement

Cooler, more d____, fluids

sink through w_____, less dense fluids.

In effect, warmer liquids and

gases r___ up.

Cooler liquids and gases s___.

ense armer ise ink

Water movement

Hot water

rises Cooler water sinks

Convection

current

Cools at the

surface

Why is it windy at the seaside?

Cold air sinks

Where is the

freezer compartment put in a fridge?

Freezer

compartment

It is put at the

top, because cool air sinks, so it cools the food on the way down.

It is warmer

at the bottom, so this warmer air rises and a convection current is set up.

The third method of heat transfer

How does heat energy get

from the Sun to the Earth?

There are no particles

between the Sun and the

Earth so it CANNOT

travel by conduction or by convection. ? RADIATION

Radiation

Radiation travels in straight lines

True/False

Radiation can travel through a vacuum

True/False

Radiation requires particles to travel

True/False

Radiation travels at the speed of light

True/False

Emission experiment

Four containers were filled with warm water. Which container would have the warmest water after ten minutes?

Shiny metal

Dull metal

Dull black

Shiny black

The __________ container would be the warmest after ten minutes because its shiny surface reflects heat _______ back into the container so less is lost. The ________ container would be the coolest because it is the best at _______ heat radiation. shiny metal radiation dull black emitting

Absorption experiment

Four containers were placed equidistant from a heater. Which container would have the warmest water after ten minutes? The __________ container would be the warmest after ten minutes because its surface absorbs heat _______ the best. The _________ container would be the coolest because it is the poorest at __________ heat radiation. dull black radiation shiny metal absorbing

Shiny metal

Dull metal

Dull black

Shiny black

Convection questions

Why are boilers placed beneath hot water

Hot water rises.

So when the boiler heats the water, and the hot water rises, the water tank is filled with hot water.

Why does hot air rise and cold air sink?

Cool air is more dense than warm air, so the

Radiation questions

Why are houses painted white in hot countries?

White reflects heat radiation and keeps the house cooler. Why are shiny foil blankets wrapped around marathon runners at the end of a race? The shiny metal reflects the heat radiation from the runner back in, this stops the runner getting cold.

[PDF] Understanding Heat Transfer, Conduction, Convection and Radiation

Understanding Heat Transfer,

Conduction, Convection and

Radiation

Heat Transfer

Heat always moves from a warmer place to

Hot objects in a cooler room will cool to

Cold objects in a warmer room will heat up

Question

If a cup of coffee and a red popsickle were

The cup of coffee will cool until it reaches

Heat Transfer Methods

Heat transfers in three ways:

Conduction

Convection

Radiation

Conduction

When you heat a metal strip at one end, the heat

Metals are different

The outer e______ of metal atoms

When the metal is

Insulators, such as w___ and p____, do not

Why does metal feel colder than wood, if they

Metal is a conductor, wood is an insulator. Metal

Convection

What happens to the particles in a liquid or a

The particles spread out and

This effects fluid movement.

What is a fluid? A liquid or gas.

Fluid movement

Cooler, more d____, fluids

In effect, warmer liquids and

Cooler liquids and gases s___.

Water movement

Hot water

Convection

Cools at the

Why is it windy at the seaside?

Cold air sinks

Where is the

Freezer

It is put at the

It is warmer

The third method of heat transfer

How does heat energy get

There are no particles

Earth so it CANNOT

Radiation

Radiation travels in straight lines

True/False

Radiation can travel through a vacuum

True/False

Radiation requires particles to travel

True/False

Radiation travels at the speed of light

True/False

Emission experiment

Shiny metal

Dull metal

Dull black

Shiny black

Absorption experiment

Shiny metal

Dull metal

Dull black

Shiny black

Convection questions

Why are boilers placed beneath hot water

Hot water rises.

Why does hot air rise and cold air sink?

Cool air is more dense than warm air, so the

Radiation questions

Why are houses painted white in hot countries?

1. Which of the following is not a

A. Radiation

B. Insulation

C. Conduction

D. Convection

2. In which of the following are

A. Solid

Insulators, such as w_ and p__, do not