Aug 01, 2000 · The tube with three-dimensional internal extended surfaces (3-DIEST) presented in this article is a new high-efficiency heat-exchange tube for forced internal convection. The schematic of the three-dimensional internal extended surface is illustrated in Fig. 1. The 3-DIEST tubes were fabricated by a patented technique of Liao . This fabrication technique has many advantages.
Oct 24, 2014 · Moreover, the three-dimensional analysis of the twisted heat exchanger has been conducted using the commercial CFD code, CFD2000. The twisted plate with a thickness of 0.3 mm is inserted in a tube which inner diameter is 7 mm. The gas flow velocities are ranged from 2.5 to 7.18 m/s for the inlet gas temperature of 323K. In the experiment, the overall heat transfer coefficient increases
NUMERICAL INVESTIGATION OF SHORT ELLIPTICAL developments of tubes [6,7] or three-dimensional reactor designs are used to enhance heat transfer, resulting in lower wall temperatures and/or higher wall shear stress and so to reduce coking rates as deduced from the well known Ebert and Panchal model (see e.g. ). Designs can be divided into two classes based on the physical reason of heat
Simulation of Flow and Heat Transfer in Tube with Twisted Tape Consisting of Alternate Axis Panida Seemawute,Smith Eiamsa-Ard Mahanakorn University of Technology, Thailand Abstract. Numerical prediction of a three-dimensional flow in the tube fitted with a twisted
Three Dimensional Study of Baffles Effect on Heat Transfer The maximum increase in heat transfer coefficient occurs with nanofluid at 0.3% concentration, which was about 28.0% to 32.0% higher than the pure water in spiral fluted tube equipped with twisted
Nov 16, 2004 · Three-dimensional numerical computation was made for a model of a two-row finned tube heat exchanger. The tube configuration is simulated with step-wise approximation, and the fin efficiency is also calculated with conjugated computation.
Three-dimensional fin-tube expansion process to achieve Sep 03, 2019 · A novel manufacturing process for expanding the tubes of fin-tube type heat exchangers using a three-dimensional (3D) spiral expanding ball fabricated via metal additive manufacturing was proposed for the manufacture of highly efficient heat exchangers. To improve the heat transfer efficiency of fin-tube type heat exchangers, fine grooves are generally formed inside a tube to increase the heat
The three-dimensional inner and outer rib finned tubes are the latest generation of high-efficiency heat-strengthening elements, which make up for the various shortcomings of the second-generation low-ribbed heat-strength tubes. By expanding the heat transfer area inside and outside the tubes, the fluid is promoted on the inner and outer
Three-dimensional performance analysis of plain fin tube Jan 10, 2013 · A commercial Finite Volume Method (FVM)-based code, CFX 12.0, is used to analyse the convective heat transfer in a three-dimensional finned tube Heat Exchanger model. This approach involves discretizing the spatial domain into finite control volumes using the mesh.
In recent years, three-dimensional tubes have been rapidly developed, and they are widely used as high-efficiency heat transfer elements in heat exchangers of different structural forms, including shell-and-tube heat transfer , evaporator and flue gas heat exchangers and air preheater, etc. In order to provide a more accurate design basis for designers using three-dimensional tube heat exchangers,
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