Abstract
The influences of modified V-shaped baffle in a squ are channel for heat transfer and thermal performan ce enhancement are presented numerically in three Dimensional (3D). The V-shaped baffles are modified in order to comfortable to installation in the square channel. The plates are used for clamping on both t he upper and lower V -shaped baffles resulting the modified V -shaped baffle like orifice plate called “V -shaped orifice tubulators, VOT”. The effects of Blockage R atios (BR = 0.05-0.20), flow attack angles ( α = 20°, 30° and 45°) and flow directions (V -Downstream and V -Upstream) with a single Pitch Ratio (PR = 1) are investigated for Reynolds number based on the hydraulic diameter of the square channel (Dh), Re = 100- 2000. The fully developed periodic flow and heat transfer are applied for the computational domain. The SIMPLE algorithm and the finite volume method are used in the current study. The numerical results show that the use of VOT not only increasing heat transfer rate, but als o rise up very enlarge pressure loss due to reducin g the flow area of the cross sectional area. In addition, the maximum thermal enhancement factors are found around 2.4 and 2.5 for BR = 0.10, α = 30° at the highest Reynolds number of V -Downstream and V -Upstream, respectively.
Highlights
IntroductionThe V-shaped baffle or rib turbulators have been usually used in order to increase heat transfer and thermal performance in many heat exchanger systems
The new designs of turbulators and their parameters; shape, attach angle, height and space have been studied.The V-shaped baffle or rib turbulators have been usually used in order to increase heat transfer and thermal performance in many heat exchanger systems
The effects of Blockage Ratios (BR = 0.05-0.20), flow attack angles (α = 20°, 30° and 45°) and flow directions (V-Downstream and V-Upstream) with a single Pitch Ratio (PR = 1) are investigated for Reynolds number based on the hydraulic diameter of the square channel (Dh), Re = 100-2000
Summary
The V-shaped baffle or rib turbulators have been usually used in order to increase heat transfer and thermal performance in many heat exchanger systems. Array of V-shaped baffle were used to insert into the channel or tube in heat exchanger to increase in heat transfer rate and efficiencies. V-shaped turbulators can help to augment heat transfer rate Ratio (b/H, BR) of V-baffle give the highest heat transfer by creating jets of the fluid flow, which impinging on the rate and provide very enlarge pressure loss. The V-shaped turbulators increase of pitch spacing or Pitch Ratio (P/H, PR) was reported heat transfer rate, and increase enlarges pressure loss by (Promvonge et al, 2010; 2012). Peng et al (2011) studied on both the parameters; height, spacing, flow attack angle, of V- experimentally and numerically for convection heat transfer shaped tablets are important to investigate. Except from the in channels with different types of ribs; 90° continuous rib, parameters, the installation method and application of V- 90° interrupted rib, 45° V-shaped continuous rib, 45° V-
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