Experimental Study of Mixing Fluid Flows with Different Temperatures in a T-Junction
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PERIMENTAL STUDY OF MIXING FLUID FLOWS WITH DIFFERENT TEMPERATURES IN A T-JUNCTION L. A. Bol’shova , N. A. Pribaturina,b,∗ , O. N. Kashinskyb , b
UDC 532.539.5
b
P. D. Lobanov , and A. S. Kurdyumov
Abstract: This paper presents the results of an experimental study of mixing fluid flows of different temperatures in a T-junction. The experiments were performed with liquids having substantially different physical properties. The distribution fields of the average and fluctuation temperatures on the surface of the wall of the T-junction, and the structure of the temperature field in the mixing region of cold and hot fluid flows were obtained. Keywords: T-junction, flow mixing, temperature, experiment. DOI: 10.1134/S0021894420030074
The mixing of two fluid flows with different temperatures in a T-junction, which is a complex thermophysical problem, is of great practical and theoretical interest. Data obtained in experimental studies of mixing fluid are also widely used to verify computational codes. Pipeline T-junction with flow mixing is characterized by turbulent mixing and vortex formation accompanied by pressure, temperature, and velocity fluctuations. This gives rise to cyclic thermal stresses on the T-junction wall, which may cause crack formation in the pipeline walls. Temperature inhomogeneity on the pipeline surface is one of the main causes of damage to power equipment [1]. Calculation of temperature fields is an important problem from the point of view of the safety of power equipment. Investigation of mixing fluid flows of different temperatures has led to the development of the OECD/NEA benchmark exercise test [2]. This test has been used for a detailed experimental investigation of the hydrodynamics and heat transfer in a T-junction into which cold and hot water flows were supplied. There have been a large number of computational studies performed on the basis of the data contained in the specification of this test. For example, flow calculations [3, 4] have been performed using the LES method. Within the framework of this test, fairly accurate results have been obtained when using Cabaret, CONV-3D, and Nek5000 computational codes [3]. A number of experimental studies have investigated mixing fluid flows of different temperatures in Tjunctions. Walker et al. [5] studied mixing isothermal fluids in T-junctions with a wire-mesh sensor and also performed calculations of the mixing process using ANSYS CFX code [6]. Dehbi and Cr´ecy [7] used the Langevin model for particle dispersion in calculations. Bol’shukhin et al. [8] performed a thermal imaging study of temperature changes in the mixing zone using a flat T-junction model, measured the frequency of temperature fluctuations through the infrared transparent wall of the T-junction, and plotted spectral curves of the fluctuation by means of a direct Fourier transform. a
Nuclear Safety Institute, Russian Academy of Sciences, Moscow 115191, Russia; [email protected]; [email protected]. b Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibir
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