What Is Thermal Convection?

Thermal convection / heat convection, also known as convective heat transfer, refers to the heat transfer process caused by the relative displacement of particles in a fluid, and is one of three ways of heat transfer.

The phenomenon that thermal particles propagate thermal energy from one place to another in a space through a flowing medium. If the fluid with mass m (kg / m · s) per unit area flows from the place of temperature t1 to t2 per unit time during thermal convection, the heat transferred by this thermal convection should be: q = mc _p (t _2- t ₁ ), the unit is W / m _2.

It can only occur in fluids (gas and liquid), and it must be accompanied by the heat conduction effect of the molecular movement of the fluid itself.

Divided by flowing medium: gas convection and liquid convection, gas

Three basic forms:

The main factors affecting thermal convection are: temperature difference, thermal conductivity, and thickness and cross-sectional area of the thermally conductive object.

The larger the thermal conductivity, the smaller the thickness, and the more heat is conducted. The larger the area of the ventilation holes in the fire, the faster the thermal convection; the higher the position of the ventilation holes, the faster the thermal convection. Thermal convection is an important way of heat transmission and is the most important factor affecting the development of early fires.