The thesis addresses the issue of cooling extruded polyethylene pipes. Knowing the process is vital for the production of pipes, as it influences the quality of the product as well as the manufacturing costs. In case of rapid and excessive cooling, the pipes become brittle and tend to crack during installation. Furthermore, excessive cooling is wasteful. In case of insufficient cooling, the profile of the pipe is compressed and turns to an oval shape when coiled. This also causes problems during installation of the pipe.
Presented is a two dimensional numerical simulation of the cooling process through several cooling troughs. It is based and calibrated to an existing production line. Presented are also the one dimensional models in the radial and axial dimension. The latter is solved in the Euler reference frame, which enables us to solve the problem in a stationary state. The thesis outlines a procedure for taking temperature measurements on the walls of the pipe, temperature measurements of water at the input and output of cooling throughs and also its mass flow measurements. These data are then used to calculate the energy drain from each through. The results from the simulations match the measurements taken from the walls of the pipe.