Simulation of Surface Intensification of Heat Exchange in Shell-and-Pipe and Heat Exchanging Devices

Rinat Shaukatovich Misbakhov¹, Victor Mihaylovich Gureev², Nikolai Ivanovich Moskalenko¹, Andrey Mihaylovich Ermakov² and Ilyas Zul’fatovich Bagautdinov¹

¹Kazan State Power Engineering University, Russia, 420066, Kazan, Krasnoselskayast., 51. ²Kazan National Research Technical University Named After A.N. Tupolev, Russia, 420111, Kazan, Marx st., 10.

DOI : http://dx.doi.org/10.13005/bbra/2228

ABSTRACT: Decrease of material consumption of heat exchanging equipment is a topical problem, which can be solved by various methods. The most widely spread method is application of heat exchange intensifiers, which allow to increase heat flow in a pipe bank in 20-30%, depending on flow condition of a heat transfer agent, while remaining the same dimensions. Ring and helical knurls, as well as dimple notches are the most widely used for intensification for heat exchange. The most manufacturableknurl is a ring knurl, which can be easily applied on pipes and only minimum number of elements is needed. On a basis of the results of analysis of existing intensifier of heat exchange the authors propose the new type of knurl –semiring. That type of intensifier is also simple like a ring curl, but is presumably has lesser hydraulic resistance. The study presented the results of the numerical simulation of shell-and-pipe of heat exchanging device with application of helical, ring, dimple notches and semiring notches. Also, values of coefficients of heat transfer, heat flow, flow structure and pressure losses in pipes and casing at various flow conditions are obtained. Use of intensifiers leads to increase of heat flow for a whole range of flows of a heat transfer agent. The largest effect can be achieved by means of application of ring intensifiers, but they also lead to the biggest increase of hydraulic resistance. The main advantage of semiring intensifiers is ease of manufacturing and lesser number of elements of intensifiers as compared with dimple notches. Use of semiring notches allows to increase heat dissipation for a whole range of flows as compared with a smooth pipe, also it is recommended to use semiring notches instead of ring for big flows of a heat transfer agent due to lower hydraulic resistance as compared with a ring knurl for all flow conditions.

KEYWORDS: Intensifier; Heat transfer; Simulation; Heat exchange; Flow structure

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