The influence of geometrical and operational parameters on thermofluid performance of discontinuous colonial self‐swirl‐inducing baffle plate in a tubular heat exchanger

Abstract

An exploratory investigation was conducted to analyze a tubular heat exchanger's turbulent heat transfer characteristics using an innovative baffle plate design. The design incorporated a perforated conical baffle plate and an adjustable rectangular deflector. The strategic placement of this baffle plate at the heat exchanger inlet facilitated a swirling flow downstream. To assess the impact of this design, three baffle plates with varying pitch ratios (l/D) were positioned in the direction of the flow. The study examined the effects of pitch ratio (ranging from 0.6 to 1.2), deflector inclination angle (ranging from 30° to 50°), and Reynolds numbers (ranging from 16,500 to 29,500). Moreover, the size of the conical baffle plate (H/D) was altered (from 0.25 to 0.15). The findings highlighted the substantial influence of pitch ratio, inclination angle, and height ratio on the heat exchanger's performance. Notably, the configuration featuring an inclination angle of 50° and height ratio of 0.15 exhibited an average performance improvement of 22% compared to other height ratios, inclination angles, and pitch ratios.

Thermal hydraulic performance of a tubular heat exchanger with in‐line perforated baffle with shutter type saw tooth turbulator

“…The sawtooth geometric parameter(space height ratio) 35 e h SH = / . Three distinct variants of the STBP were fabricated for analysis in an HX of BR = 0.70.…”

“…However, using two opposite-oriented flow deflectors caused a 0.19 times degradation in thermal performance upon comparison with HX with a segmented baffle plate, 32 which was due to the reason that even though a higher h m is obtained but at the expense of higher Δp. Rahman 35 further perforated the conical baffle plate and attached rectangular flow deflectors, resulting in a 22% enhancement in thermal efficiency. In another analysis, 36 he utilized two 16 rectangular shutter-type flow deflectors to induce turbulence, resulting in a 1.17 improvement in thermal efficiency when PR was 1 and α was 30.…”

Review on Nanofluids: Preparation, Properties, Stability, and Thermal Performance Augmentation in Heat Transfer Applications

“…The ratio of the enhancement rate indicating the surge in HT to f is known as THP. Equations and present the primary criteria for evaluating the THP of the thermal system. − Models above a THP of 1 are considered advantageous, whereas models below this threshold are deemed unfavorable. The flow and thermal characteristics of nanofluids play a crucial role in evaluating and enhancing their performance.…”

The effect of triangular shutter type flow deflector perforated baffle plate on the thermofluid performance of a heat exchanger

“…20 The findings suggest that opposite-oriented deflectors lead to higher HT rates but come with increased frictional losses. Rahman 21 further employed the same principle of perforation with a flow deflector to a conical baffle plate and obtained a 22% improvement in TEF.…”