Final control questions on the subject “heat engineering” The purpose and function of the subject. Working parameter. Status parameters. Base words and phrases

 
Base words and phrases: convection, similarity, conditions, similar numbers, critical 
equations 
Convective heat exchange refers to the transfer of heat between a solid surface and a fluid due to 
the motion of the fluid. This process occurs through the mixing of hot and cold fluid layers, 
which results in the transfer of heat from one region to another. The process of convective 
heat exchange can be described mathematically using various similarity conditions and 
equations. 
One of the simplest similarity conditions in convective heat transfer is the Reynolds number. The 
Reynolds number relates the inertial forces of fluid motion to the viscous forces of the fluid 
and determines whether a fluid flow is laminar or turbulent. The Reynolds number is defined 
as the ratio of inertial forces to viscous forces and is a critical parameter in determining the 
heat transfer rate. 
Another important similarity condition in convective heat transfer is the Prandtl number. The 
Prandtl number relates the momentum and thermal diffusivities of a fluid and is an important 
parameter in determining the rate of heat transfer. 
In addition to these similarity conditions, there are also several critical equations in convective 
heat transfer. These include the Navier-Stokes equations, which describe the motion of a fluid, 
and the energy equation, which describes the conservation of energy in a fluid. These 
equations are solved using boundary and initial conditions to determine the heat transfer rate 
and temperature distribution in a fluid. 
Overall, the process of convective heat transfer requires an understanding of the fluid motion, the 
condition of heat exchange, and the similarity conditions and equations that govern the 
process. By calculating the Reynolds and Prandtl numbers and solving the appropriate 
equations, it is possible to determine the rate of heat transfer in a convective system. 
28. Radiant heat exchange.