Affiliation:
1. Kazan State Power Engineering University
2. Kazan National Research Technological University
Abstract
The fouling of heat exchange equipment leads to serious economic losses in many industries, therefore to find a method to reduce deposits on heat transfer surfaces remains an actual task. In this paper, a practical solution is proposed for the implementation of a pulsating cleaning method of oil coolers as an example. The influence of pulsations on cleaning of the external surface of the heat exchanger is studied by computer modeling with Ansys Fluent. The fluid flow was described by the Navier-Stokes equation, particle motion and their interaction was described by the discrete element method (DEM). In the study, a staggered tube bundle was considered. The pulse frequency 0,3125 Hz, the amplitude referred to the diameter of tube is 35, the Reynolds number 100, the duty cycle of the pulsations 0,25. Oil was chosen as the medium. Evaluation of the pulsating cleaning method was carried out on the basis of the analysis of the mechanics of particle collisions on the surface of the central cylinder in the beam, with stationary and pulsating flow. It was found that the pulsating flow helps to reduce deposits in the front of the cylinder and is not effective in the back. An analysis of the mechanics of particle impact on the heat exchange surface showed that this pulsation mode is more effective for removing plastic deposits.
Publisher
Kazan State Power Engineering University
Subject
Pharmacology (medical),Complementary and alternative medicine,Pharmaceutical Science
Reference20 articles.
1. Khaibullina AI. Improving the efficiency of heat exchangers by imposing on the flow in the annular space of low-frequency pulsations. dissertation. Kazan State Power Engineering University, Kazan. 2017. P. 229.
2. Zohir AE. The Influence of Pulsation on Heat Transfer in a Heat Exchanger for Parallel and Counter Water Flows. New York Science Journal. 2011;4(6):61-71.
3. Zohir AE, Heat transfer characteristics in a heat exchanger for turbulent pulsating water flow with different amplitudes. Journal. Am. Sci. 2012;8:241-250.
4. Guoneng Li, Youqu Zheng, Guilin Hu, et al. Experimental Study of the Heat Transfer Enhancement from a Circular Cylinder in Laminar Pulsating Cross-flows. Heat Transfer Engineering. 2016;37(6):535-544.
5. Li G, Zheng Y, Xu Y, et al. Experimental investigation on heat transfer enhancement from a heated circular cylinder with constant heat input power in turbulent pulsating crossflows. Heat and Mass Transfer. 2014;50(6):1417-1427.