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International Journal of Engineering and Advanced Research Technology

Volume 4 Issue 1 (January 2018)

S.No. Title & Authors Page No View

Title : DEM Study on Flow Characteristics of Granular Material in a Heat Exchanger with Immersed Tubes

Authors : Daichang Guo, Bin Zheng, Haotian Liang, Yongqi Liu, Peng Sun

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Abstract :

The heat exchanger with immersed tubes is one of the core equipment for recovering the waste heat of semi-coke. The particle flow in the heat exchanger is closely related to its heat exchange efficiency. In order to clarify the flow characteristics of semi-coke particles in the heat exchanger, a numerical calculation model of the heat exchanger was established by the discrete element method (DEM) in this paper. The process of particle flow in the heat exchanger was simulated by the model. The evolution of flow patterns, residence times and average velocity distributions of particles in the heat exchanger were analyzed. The results show that though the immersed tubes have a significant influence on the particle flow, the uniformity of the particle flow is good. There are major flow region of the center, major flow regions of the left and the right, flow around regions and boundary layers in the heat exchanger. The movement of particles in major flow region of the center is the fastest, in major flow region of the left or the right is the next, and in a flow around region or a boundary layer is the slowest.


Title : 2D Thermal simulation of a mixed convection cooled power transformer and its analysis of the flow dynamics affecting the cooling of the windings

Authors : Alejandro Roberto Tello Campos, Saul Garcia Hernandez, William Vicente, Ignacio Carvajal Mariscal, Rodrigo Ocon Valdez

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Abstract :

A 2D CFD study of the fluid dynamic behavior of the cooling oil under fixed heat dissipation conditions is considered valuable in vertical and horizontal cooling ducts in a real three-phase 33.6 MVA, 115/34.5 kV power transformer when varying the inlet oil velocity. The outcome of this CFD study is an evaluation of the thermal behavior regarding the fluid dynamics of the cooling oil and the implications of having different oil inlet velocities in the cooling of the power transformer phases.  The results show a clear dependence of the cooling of the windings on the oil inlet velocities and shows the deficiency of the external radiator system and ways to improve it. Specifically, according to the oil temperatures found in the phases, there is a tendency to have the highest values in the windings located away from the oil inlet. Also, when the oil velocity reaches 0.1 m/s, the highest oil temperature in Phase C is 323 K as opposed to when the oil velocity is 0.002 m/s, the oil temperature is 400 K.