Purpose

The purpose of this paper is to investigate thermohydraulic characteristics of turbulent flow of water (4,000 = Re = 10,000) in a rectangular channel equipped with perforated chevron plat-fin (PCPF) with different vortex generators (VGs) shapes.

Design/methodology/approach

First, three general shapes of VGs including rectangular, triangular and half circle, are compared to each other. Then, the various shapes of rectangular VGs, (horizontal, vertical and square) and triangular VGs, (forward, backward and symmetric) are evaluated. To comprehensively evaluate the thermohydraulic performance of the PCPF with various VG shapes, the relationship between the Colburn factor and the friction factor (j/f) is presented, then a performance index (η) is applied using these factors.

Findings

Results show that the enhanced models of the PCPF, which are equipped with VGs, have higher values of j/f ratio and η as compared with the reference model (R). Further, the half-circle VG with the lowest pressure drop values (about 2.4% and 4.9%, averagely as compared with the S and ST vortex generators), shows the highest thermohydraulic performance among the proposed shapes. The maximum of performance index of 1.14 is found for the HC vortex generator at Re = 4,000. It is also found that the square and forward triangular VGs, have the best thermohydraulic performance among the rectangular and triangular VGs respectively and the highest performance index of 1.13 and 1.11 are reported for these VGs.

Originality/value

The thermohydraulic performance of the PCPF with different vortex generators VGs shapes have been investigated.

中文翻译：

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评估涡流发生器的形状，以增强配备有穿孔V形人字形翅片的通道中流体流动的热工性能

目的

本文的目的是研究在配备有不同涡流发生器（VG）形状的穿孔人字形翅片（PCPF）的矩形通道中水的湍流（4,000 = Re = 10,000）的热工水力特性。

设计/方法/方法

首先，将VG的三种常规形状（包括矩形，三角形和半圆形）相互比较。然后，评估矩形VG（水平，垂直和正方形）和三角形VG（向前，向后和对称）的各种形状。为了全面评估各种VG形状的PCPF的热工液压性能，提出了Colburn系数和摩擦系数（j / f）之间的关系，然后使用这些系数应用性能指标（η）。

发现

结果表明，与参考模型（R）相比，配备有VG的PCPF增强模型具有更高的j / f比和η值。此外，在建议的形状中，具有最低压降值（与S和ST涡流发生器相比平均约为2.4％和4.9％）的半圆VG表现出最高的热工液压性能。在Re = 4,000时，发现HC涡旋发生器的最大性能指数为1.14。还发现方形和正三角形的VG在矩形和三角形VG中分别具有最佳的热工液压性能，据报道，这些VG的最高性能指数为1.13和1.11。

创意/价值

已经研究了具有不同涡流发生器VG形状的PCPF的热工液压性能。