# What is the formula of heat equation?

## What is the formula of 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 Heatflow formula?

The equation of heat flow is given by Fourier’s Law of Heat Conduction. Rate of heat flow = – (heat transfer coefficient) * (area of the body) * (variation of the temperature) / (length of the material)

Is heat a second order equation?

So, for the heat equation we’ve got a first order time derivative and so we’ll need one initial condition and a second order spatial derivative and so we’ll need two boundary conditions. The boundary conditions will tell us something about what the temperature and/or heat flow is doing at the boundaries of the bar.

Is heat an elliptic equation?

The Laplace equation uxx + uyy = 0 is elliptic. The heat equation ut − uxx = 0 is parabolic.

### Why is heat conduction important?

Heat conduction occurs by transfer of vibrational energy between molecules, or movement of free electrons. Conduction is particularly important with metals and occurs without observable movement of matter. Higher rates of heat transfer are possible with forced convection compared with natural convection.

### Is heat rate and heat flux the same?

Heat flux or thermal flux is the rate of heat energy transfer through a given surface, per unit surface. Heat rate is a scalar quantity, while heat flux is a vectorial quantity. To define the heat flux at a certain point in space, one takes the limiting case where the size of the surface becomes infinitesimally small.

Which is an elliptic equation?

Elliptic equation, any of a class of partial differential equations describing phenomena that do not change from moment to moment, as when a flow of heat or fluid takes place within a medium with no accumulations.