Open AccessDetermination of thermal parameters of a shell and tube heat exchanger with increased turbulization of the working fluid
Author(s) -
Nikolay Nikulin,
Л. А. Кущев,
A. Yu Feoktistov
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/945/1/012004
Subject(s) - shell and tube heat exchanger , plate heat exchanger , concentric tube heat exchanger , plate fin heat exchanger , heat exchanger , heat spreader , micro heat exchanger , mechanics , laminar flow , heat transfer coefficient , heat transfer , materials science , dynamic scraped surface heat exchanger , prandtl number , moving bed heat exchanger , thermodynamics , mechanical engineering , critical heat flux , engineering , physics
Shell and tube heat exchangers are still widely used. This equipment is widely used in heat supply systems, food, chemical and petroleum industries. Therefore, conducting research to improve their performance is an important area. By changing the geometry of the heat exchange surface, the flow of the working fluid is further turbulated and the heat exchange area increases. The heat exchanger with a developed heat exchange surface is proposed, which differs from the serial device (with smooth tubes). Thus, a plate equipped with a cylindrical edge is installed on the heat exchange tube. The working fluid in the inter-tube space, flowing around the edges, is turbulated. This reduces the thickness of the laminar sublayer on the plate and edge. Accordingly, the heat transfer from the heat exchange surface to the streamlined fluid increases. When new elements appear in the design of the heat exchange surface, it is necessary to develop the calculation of temperature parameters for these surfaces. Formulas for calculating the average surface temperature of the edge and plate under conditions of turbulent flow around these surfaces are obtained analytically. The temperatures of the plate and edge will determine the Prandtl criterion Pr. In the future, this is necessary to find the main parameter of the heat exchanger – the heat transfer coefficient.