## What is the formula for thermal diffusivity?

Thermal diffusivity is the rate of transfer of heat of a material from the hot side to the cold side – a measure of how quickly a material can absorb heat from its surroundings. It can be calculated by taking the thermal conductivity divided by density and specific heat capacity at constant pressure.

## What is Rho CP?

Transcribed image text: where (rho cp) is the volumetric heat capacity, K is the thermal conductivity and S is a source/sink term. Recall that the earth is spherical and assume the dominant transport of heat occurs in the radial direction only.

**What is K in Prandtl number?**

The Prandtl number (Pr = ν / α) is defined as the dimensionless ratio between kinematic viscosity (ν) and thermal diffusivity, α = k / (ρ·cp); where k stands for thermal conductivity, ρ stands for density, and cp is the (isobaric) specific heat capacity.

### What is Rho in heat transfer?

ρ is density (kg/m³) cp is specific heat capacity (J/(kg·K))

### What is the term α in equation α k /( ΡCP?

The thermal diffusivity can be expressed in terms of the thermal conductivity, the density and the specific heat as α=k/(ρcp).

**How do you write a heat equation?**

Heat energy = cmu, where m is the body mass, u is the temperature, c is the specific heat, units [c] = L2T−2U−1 (basic units are M mass, L length, T time, U temperature). c is the energy required to raise a unit mass of the substance 1 unit in temperature.

## What is CP in heat transfer?

The specific heat capacity Cp [kJ/kg/°C] is a thermodynamic property specific of the fluid used to transfer heat. The specific heat capacity of water does vary with temperature but for the scope of a hot water loop it is essentially constant.

## How do I find out my PR number?

The Pr number (Pr = Cpμ/k) is calculated from Eq. (8.17) and only depends on the properties of the fluid. At a given T and P, the thermodynamic state of the fluid is fixed.

**What do you mean by Sherwood number?**

Sherwood number represents the ratio between mass transfer by convection (β) and mass transfer by diffusion (δ/L). It is the mass transfer equivalent of Nusselt Number, Nu, and is a function of Reynolds Number, Re, and Schmidt Number, Sc.

### What is Rho thermal resistivity?

Thermal resistivity, or Rho, is defined in the National Electrical Code (2014) as “the heat transfer capability through a substance by conduction.” It is the reciprocal of thermal conductivity. Thermal resistivity is often reported in different measurement units.

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