Table of Contents
What is thermal diffusivity and its significance?
Thermal diffusivity is the thermal conductivity divided by density and specific heat capacity at constant pressure. It measures the ability of a material to conduct thermal energy relative to its ability to store thermal energy. High diffusivity means heat transfers rapidly.
Which is more important thermal conductivity or thermal diffusivity?
It can be understood as the ability of a material to conduct heat, relative to the heat stored per unit volume. That means, higher the thermal diffusivity, higher the thermal conductivity. Unlike thermal conductivity, thermal diffusivity is not a frequently used term.
What is thermal diffusivity dependent on?
Thermal diffusivity depends on thickness, such that D→0 as L→0 and D is nearly constant at large L. • Thermal diffusivity of monomineralic rocks and ceramics is governed by the material property and porosity in a simple equation, if the pores are air-filled, up to porosities of ~40\%.
What is thermal capacity of a body?
“The thermal capacity of a body is the heat necessary to raise the temperature of the body by one degree.” Thermal capacity = mass of body × specific heat. EXAMPLE.
What is thermal diffusivity of a substance?
The thermal diffusivity of a substance or material is the thermal conductivity divided by the density and specific heat capacity at constant pressure and is a measure the rate of transfer of heat of a substance or material from the hot side to the cold side.
What is the relation between thermal diffusivity and thermal conductivity?
It can be understood as the ability of a material to conduct heat, relative to the heat stored per unit volume. That means, higher the thermal diffusivity, higher the thermal conductivity. Therefore, materials having higher thermal diffusivity conduct heat quickly through them.
Is thermal diffusivity is a function of temperature?
Thermal diffusivity has been measured for all the samples as a function of temperature.