Experimental study of the influence of fluid turbulization on the parameters of the heat exchanger

This article is devoted to the research of the influence of cooling fluid turbulization inside the agricultural tractors aluminium heat exchangers on the efficiency of their heat emission. To create the cooling fluid turbulization inside the aluminium heat exchangers tubes plastic helical turbulator which forms a cooling fluid turbulence in the heat exchanger are mounted. The study was carried out at heat wind tunnel in the research laboratory at St. Petersburg State Agrarian University. The essence of the study was to test comparatively agricultural tractors aluminum heat exchangers without turbulators and with turbulators in the form of twisted inserts on the basis of heat-resistant plastic. According to the study the authors obtained the functional dependence of hydraulic resistance, heat emission and heat transfer coefficient of aluminium heat exchangers with turbulators and without on the cooling fluid rate. Analyzing the functional dependence, the authors found out that the hydraulic resistance of the aluminum heat exchangers with turbulators as compared to the heat exchangers without turbulators is 9,2 %, the heat emission 8,4 %, and heat transfer coefficient 9,7 % higher. On the basis of this, the authors consider that the application of the turbulator in aluminium heat exchangers increases the efficiency of the cooling system of agricultural tractors.