Introduction to Cavity

2. Convection Heat Transfer In The Cavity

Convection heat transfer and fluid flow in cavities are of particular interest due to their numerous engineering applications, including solar thermal systems, heat exchangers, building cooling/heating, room ventilation, cooling of electronic devices, drying devices, thermal energy storage systems, fuel cells. Numerous research looked at how different factors affected the rate of heat transfer and fluid flow in cavities. These parameters include the improved thermal properties of unconventional working fluids, the porosity, shape of cavity and the presence (either fully or partially) of a magnetic field. The use of nanoparticles to improve the thermal characteristics of fluids has been thoroughly examined in Chapter 3. Nanofluids, which have better qualities to regular fluids, can help in heat transfer in cavities. The concept of porosity can be defined as the entire volume of the environment that the empty space occupies, expressed as a fraction. The symbol for porosity is e, and its common value for natural environments is less than 0.6. In addition, a porous medium is a substance composed of a solid network joined together by voids or empty pores. The same existing pores are the source of fluid flow. Furthermore, the distribution of these pores is erratic in terms of shape and size.