Chapter 13 The Transfer of Heat.

Slides:

Advertisements

Similar presentations

8 TH GRADE SCIENCE LEAP Assessment PowerPoint Practice.

Advertisements

The Atmosphere: Structure and Temperature

As close to chemistry as we can get

Physics 101: Lecture 28, Pg 1 Physics 101: Lecture 28 The Transfer of Heat l Today’s lecture will cover Textbook Chapter 13 è The Transfer of Heat »Convection.

C H A P T E R 13 The Transfer of Heat. The Transfer of Heat Q: Name three methods of heat transfer?

Question of the Day Label the heat movement as conduction, convection or radiation. 1.Lava Lamp2.Fire3.Spoon in soup.

Chapter 22 Heat Transfer.

Heat Transfer Chapter 22. Conduction Conduction – energy transfer from particle to particle within certain materials, or from one material to another.

C H A P T E R 13 The Transfer of Heat Q: Name three methods of heat transfer? A: Convection, Conduction, and Radiation.

Transferring Thermal Energy. Conduction Thermal energy is transferred from place to place by conduction, convection, and radiation. Thermal energy is.

Heat Transfer Introduction

Physics 2 Chapter 11 Sections 3-4. Latent Heat Amount of heat energy per kg that must be added or removed when a substance changes from one phase to another.

In the Atmosphere Thermal Energy Transfer. Temperature and Thermal Energy TEMPERATURE - a measure of the average kinetic energy of the individual particles.

Heat Transfer  How is heat transferred from one place to another?  What is moving?  In mechanics energy can be transferred through a particle (e.g.

Phy 202: General Physics II

Law of Conservation of Energy

Rate in Thermal Systems. Objectives Define Heat flow rate and its SI and English units of measure. Describe the heat transfer processes of conduction,

Lesson 3.  Thermal energy and heat play significant roles in our lives from the furnaces that heat our homes to winds generated by the uneven heating.

MECHANISMS OF HEAT TRANSFER

Thermal Energy Chapter 14. Key Ideas  What does temperature have to do with energy?  What makes things feel hot or cold?  What affects the rate that.

Copyright © 2010 Pearson Education, Inc. Lecture Outline Chapter 16 Physics, 4 th Edition James S. Walker.

Heat Transfer Convection is the transfer of heat by the bulk movement of a fluid. Convection can be natural or forced.

Chapter 13 The Transfer of Heat.

Transmission of Heat. Conduction n Heat transfer due to direct contact n Either between different materials in thermal contact or different parts of the.

Thermal Physics Modes of Heat Transfer.

 Thermal conductor – a material through which thermal energy flows easily  EX: metals  Thermal Insulator – a material through which thermal energy.

Heat Transfer Conduction, Convection, and Radiation.

Lecture 33Temperature and Heat1 The Transfer of Heat Adapted from Dr. Al-Kofahi. Picture ref’s:Cutnell & Johnson PC225, Dec 3 rd.

Thermal Energy and Heat thermal energy the total kinetic and potential energy of the atoms or molecules of a substance heat the transfer of energy from.

Thermal Physics. TEMPERATURE measures the tendency for energy to leave an object spontaneously a measure of the average kinetic energy of the molecules.

Chapter 6: Thermal Energy. Section 1: Temperature and Heat  Temperature is related to the average kinetic energy of the particles in a substance.

Transferring Thermal Energy!. Conduction Transfer of thermal energy by direct contact During collision, kinetic energy of faster moving particle transferred.

Conduction, Convection, and Radiation

Conduction Convection & Radiation

H EAT C ONDUCTION  Solids can be divided into two types, regarding conduction of heat: Topic 3.1 Extended A – Heat transfer  Conductors and nonconductors.

MECHANISM OF HEAT TRANSFER.  HEAT TRANSFER  Occurs only between regions that are at different temperature and its direction is always from higher to.

Thermal Energy. Warm Up: To shape metal into a horseshoe, the metal is heated in a fire. Why will a horseshoe bend when it’s very hot, but not after it.

Conduction, Convection, Radiation Chapter 6, Lesson 2.

Energy Transfer Methods of energy Transfer Three ways energy is transferred: 1. Conduction- occurs between objects in direct contact. a. Objects.

Thermal Energy 11/1/2011. What is thermal energy? Thermal energy is also known as heat and is the kinetic energy of all the molecules in a material. If.

Heat transfer mechanism Dhivagar R Lecture 1 1. MECHANISMS OF HEAT TRANSFER Heat can be transferred in three different ways: conduction, convection, and.

Physical Principles of Remote Sensing: Electromagnetic Radiation

Chapter 13 The Transfer of Heat.

Thermal Energy On The Move

Heat Transfer Convection is the transfer of heat by the bulk movement of a fluid. Convection can be natural or forced.

Chapter 2; Section 2 Atmospheric Heating

YouTube Video Heat &Thermal Energy YouTube Video

Thermal Energy & Heat Ch. 16 Intro to Physics.

Conduction, Convection, and Radiation

Energy Transfer.

Heat Chapter 4 PSC 1515.

Topic 8.5: Blackbody Radiation

Vocabulary Week 4.

Warm Up #3 What will happen to the air temperature near the campfire?

Chapter 13 TRANSFER OF HEAT is minimized by multiple layers of beta cloth. These and other insulating materials protect spacecraft from hostile environmental.

Physics 2 – Mar 6, 2018 Do Now – How much power is generated by a windmill if it’s blades are 1.30 m long, the density of air is 1.15 kg/m3 and the wind.

Chapter 2; Section 2 Atmospheric Heating

Energy Transfer Through Heat

Chapter 13 The Transfer of Heat.

Review Questions pp # 1-20 Chapter 22 Heat Transfer Review Questions pp # 1-20.

THERMAL ENERGY AND HEAT

The Transfer of Heat Chapter 13.

Purdue University, Physics 220

MSTC Physics B Chapter 11 Section 4.

THERMAL ENERGY.

Presentation transcript:

Chapter 13 The Transfer of Heat

13.1 Convection The process in which heat is carried from place to place by the bulk movement of a fluid. Examples: heating a pot of water, heating (or cooling) a home, ground warming neighboring air Birds use “thermals” to soar through the air. Convection principles are being used to cool everything from athletes to automobile engines.

13.2 Conduction The process whereby heat is transferred directly through a material, with any bulk motion of the material playing no role in the transfer. Movement of particles causes collisions with other particles. Collisions increase KE of all particles involved, thus increasing temperature of material. Metals are great conductors because the “sea of electrons” allows quick, easy transfer of energy.

Factors Affecting Conduction Q is proportional to the time conduction takes place. (More time = more heat flow) Q is proportional to the temperature difference. (Larger ∆T = more heat flow) Q is proportional to cross-sectional area. (Larger area = more heat flow) Q is inversely proportional to length. (Greater lengths conduct less heat)

Equation for Conduction of Heat SI unit of thermal conductivity: J/(smC°) Why does a down coat keep me warm? Q is heat conducted t is time through material L is material length A is cross-sectional area ∆T is temperature difference k is thermal conductivity (a numerical constant describing the ability of the material itself to conduct heat due to its chemical structure)

13.3 Radiation Radiation is the process in which energy is transferred by means of electromagnetic waves. These waves do not require a medium. ALL BODIES continuously radiate energy in the form of electromagnetic waves. Objects on Earth radiate infrared waves.

Why am I so uncomfortable wearing black in the summer? Interesting Tidbits The term blackbody is used to describe an object that absorbs all the electromagnetic waves falling on it. All objects emit and absorb electromagnetic waves simultaneously. A good absorber is also a good emitter. Why am I so uncomfortable wearing black in the summer?

Factors Affecting Radiation Q increases with more time. Q increases with surface area. Q increases with the 4th power of Kelvin Temperature. (Increasing temp. dramatically increases heat transfer)

The Stefan-Boltzmann Law of Radiation σ is the Stefan-Boltzmann constant and is equal to 5.67 x 10-8 J/(sm2 K4 ) e is the emissivity. This number will be between 0 and 1. It describes the ratio of the energy the object actually radiates to the energy it would if it were a perfect emitter. This value depends on the condition of the surface.

Sample Problem The supergiant star Betelgeuse has a surface temperature of about 2900K and emits a radiant power of approximately 4 x 1030 W. Assuming that Betelgeuse is a perfect emitter (e =1) and spherical, find its radius. Q/t is the power emitted so A is equal to … And A is equal to Rearranged Finally…