On the other hand, thermal diffusivity is changing the temperature as fluid moves up and down the fingers.

The higher the thermal diffusivity of the sample, the faster the energy reaches the backside.

Thermal diffusivity is often measured with the flash method.

Thermal diffusivity is a measure of the speed at which temperature waves can penetrate a substance.

In a sense, thermal diffusivity is the measure of thermal inertia.

"I discovered a new carbon-car-bon-silicon ceramic with a radically high thermal diffusivity.

The great benefit of this device is that it measures both thermal diffusivity and volumetric heat capacity.

The thermal diffusivity coefficient, represented as alpha, can be written as .

The laser flash method is used to measure thermal diffusivity of a thin disc in the thickness direction.

Please reference him to Fourrier's heat formula and its derivatives where he will find that the relation between the two is thermal diffusivity.

It is essential to the dynamics that thermal diffusivity produces significant heat transfer between the downgoing and upgoing fingers.

For mercury, heat conduction is very effective compared to convection: thermal diffusivity is dominant.

The general diffusivity, , is redefined as a thermal diffusivity, .

Thermal diffusivity.

Extensive tables of measured thermal diffusivity, specific heat capacity, and derived density, all as functions of temperature, have been published.

In a one-dimensional, adiabatic case the thermal diffusivity is calculated from this temperature rise as follows:

Lewis number is a dimensionless number defined as the ratio of thermal diffusivity to mass diffusivity.

In the above equation Thermal Diffusivity, and both the density and velocity remains constant u across the interval of integration.

(Low - thermal diffusivity dominant)

For measuring the thermal diffusivity, which is strongly temperature-dependent, at different temperatures the sample can be placed in a furnace at constant temperature.

By recording temperature vs. time response in the sensor, the thermal conductivity, thermal diffusivity and specific heat capacity of the material can be calculated.

In metals, the thermal diffusivity is coupled with the electrical conductivity, suppressing the formation of a thermal spike.

Here, is the thickness of the oceanic mantle lithosphere, is the thermal diffusivity (approximately 10 m/s), and is time.

A state-of-the-art laser flash apparatus (LFA) to measure thermal diffusivity over a broad temperature range, is shown on the right hand side.

In the physical problem of temperature variation, u(x,y,z,t) is the temperature and α is the thermal diffusivity.