Abstract
In this article, the performance and applications of a Spiral Plate Heat Exchanger are demonstrated. Also, governing equation of heat transfer phenomena in such heat exchangers is discussed. Regarding the governing equations, a LAB-sized model of this type of heat exchanger was designed and constructed. Galvanized Iron sheets were used as the heat transfer surfaces. Two Galvanized Iron sheets were rolled together around a central core and, as a result, two separated channels were made. Also, a predesign simulation of the heat exchanger was done using the Fluent software to predict the performance of the heat exchanger. First the geometry was made using Gambit software environment then the model was analyzed through Fluent. Because of less fouling, easier cleaning and high heat transfer coefficient, Spiral Heat Exchanger is a good alternative to the other types of heat exchangers, especially when it’s going to handle high fouling flows or highly viscous fluids. Low fouling rate of the heat exchanger, reduces the need of cleaning and therefore the out of service will be decreased. In the constructed heat exchanger, Nusselt number increases as the mass flow rate increases. Average Nusselt number is about 100 that is very good.
Highlights
Heat exchangers are approximately the most used parts in chemical processes and can be seen in almost all industrial units
This article studies the distribution of temperature and Nusselt number through Gambit and Fluent software
Heat transfer from hot fluid to cold fluid was done along the heat exchanger
Summary
Heat exchangers are approximately the most used parts in chemical processes and can be seen in almost all industrial units. These are the tools providing the possibilities for heat transfer between two or more fluids. There are two possibilities to seal the sides of the heat exchanger: using bolts and gaskets to fasten the covering sheets to the heat exchanger or welding the covering sheets to the heat exchanger. One passaged path of the flow, spiral shape of the path, and existence of studs among the channels will lead to turbulent flows even at velocities lower than anticipated This and spiral nature of the flow cause permanent impact of the fluid particles to the heat transfer surfaces, and so, prevent the fouling. It must be mentioned here that for the heat exchangers that have more than one passage to flow through, such as for the case of shell and tube heat exchanger, when fouling occurs in one passage, flow will go through another passage and the speed in first passage decreases and the fouling will grow even more
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