Heat transfer by J P Holman To Research on the heat Diffusing Transporting and Radiating in the Material Systems
Heat Transfer by J P Holman To Research on the Heat Diffusing , Transporting and Radiating in the Material Systems
Chapter One Introduction Heat Heat is a kind of energy Which occurs in the transfer process. the transferred energy contains the orderly work and disorderly heat) Energy: Concept of energy is used to specify the state of a system in thermodynamics a Heat Transfer a kind of application science, is concerned with analysis of the rate of heat transfer taking place in system, or with the research on the heat-transfer regularity
Chapter One Introduction Heat:Heat is a kind of energy, Which occurs in the transfer process. (the transferred energy contains the orderly work and disorderly heat) Energy: Concept of energy is used to specify the state of a system in thermodynamics Heat Transfer:A kind of application science, is concerned with analysis of the rate of heat transfer taking place in system, or with the research on the heat-transfer regularity
1 Some Basic Concepts and Definitions System research region or scope a physical space a Internal energy measure of motion of microscopic particles a Temperature measure molecular mean kinetic energy Enthalpy internal energy plus displacement work Work orderly energy force multiplies displacement in the force direction Heat flow transferred heat quantity per unit time
1 Some Basic Concepts and Definitions System research region or scope, a physical space Internal energy measure of motion of microscopic particles Temperature measure molecular mean kinetic energy Enthalpy internal energy plus displacement work Work orderly energy, force multiplies displacement in the force direction Heat flow transferred heat quantity per unit time
Some Basic Concepts and Definitions a Heat flux transferred heat quantity per unit time and per unit area perpendicular to the direction of the heat flow Heat source equipment or region to produce or provide heat flow for system a Heat transfer elements thermal resistance thermal capacity thermal inductance a Change in phase substance state is changed Continuity Supposition the macroscopic continuity but the microscopic discontinuity
1 Some Basic Concepts and Definitions Heat flux transferred heat quantity per unit time and per unit area perpendicular to the direction of the heat flow Heat source equipment or region to produce or provide heat flow for system Heat transfer elements thermal resistance, thermal capacity, thermal inductance Change in phase substance state is changed Continuity Supposition the macroscopic continuity but the microscopic discontinuity
2 Process of heat transfer a heat transfer process occurs when the internal energyfor enthalpy)in a system is not well distribution(has nt been even), or When the internal energy of system is different from that of its surrounding The energy transport by heat flow can't be measured directly. The concept has physical meaning because it is related to the measurable temperature
2 Process of heat transfer heat transfer process occurs when the internal energy(or enthalpy) in a system is not welldistribution (has n ’t been even), or when the internal energy of system is different from that of its surrounding. The energy transport by heat flow can ’t be measured directly. The concept has physical meaning, because it is related to the measurable temperature