Experimental and Computational Fluid Dynamics Studies on Straight and U-Bend Double Tube Heat Exchangers with Active and Passive Enhancement Methods

Andrzejczyk, Rafał; Muszyński, T.; Kozak, Przemysław

doi:10.1080/01457632.2019.1699279

Cited by 16 publications

(9 citation statements)

References 25 publications

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“…Figure 3 is dedicated for a comparison between the current results and those of references [29,30] experiment. The two curves for each case, plain DPHE (green), DPHE with air injection (blue), DPHE built with solid, plain turbulator (red), are plotted for the purpose of validation only.…”

Section: Pressure Dropmentioning

confidence: 98%

“…According to past studies like [1,2,7,9,32] which revealed all forms of turbulators, the wire coil is the best choice for overall double-pipe heat exchanger performance. The current work considers a helical perforated turbulator, mimicking the study of Andrzejczyk et al [29,30] which used a rigid turbulator with helical shape only. All other specifications and measurements of these geometries are same.…”

Section: Mathematical Analysismentioning

confidence: 99%

“…The mesh was construed with taking into account the most refined meshes for the small holes with small flow passages. The mesh independence tests were started with a mesh covering the description provided by Andrzejczyk et al [30]. Then, the number of elements was increased 50% three times for each: coarse, fine, and refined mesh.…”

Section: Mesh Modelingmentioning

confidence: 99%

“…The experimental and numerical results were obtained by Andrzejczyk et al [29,30] for DPHE incorporating passive and active enhancement techniques, which were helical turbulator and air-bubble injection. The configurations of turbulator alone performed the highest heat transfer, pressure drop, and overall efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, the solution data and geometry specifications of the studies [29][30][31] experiments are relied on for further investigation. The new technique to include perforations in a turbulator is evaluated herein.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A Computational Study of Perforated Helical Tube Inserted in a Double Pipe Heat Exchanger with Fluid Injection

Abdulrasool¹,

Aljibory²,

Abbas³

et al. 2023

IJHT

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Heat exchangers are still in high demand for the majority of industrial applications. A double pipe heat exchanger, also known as a DPHE, is a device that is used to transfer heat from hot to cold liquids, primarily water. It is therefore of great importance to discover new methods improving their thermal-hydraulic performance. In the current computational study, the focus will be on a helical turbulator constructed with small perforations and built inside the annulus of DPHE. First, our results are validated against their counterparts of an experiment conducted by others to examine the flow under the effect of a helical solid wire and/or global air blown inside the annulus. Second, four cases are introduced to the flow inside the helical tube only, two different mass flow rates for single and two phase flows. All findings suggest that the optimal performance comes from pumping some quantity of the working fluid inside the helical tube with roughly 600% and 45% increase in terms of overall heat transfer coefficient and thermal effectiveness, respectively, compared to that of non-perforated turbulator. Furthermore, for this proposed device, single-phase flow with or without oscillations outperforms two-phase and/or steady flow.

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Section: Pressure Dropmentioning

confidence: 98%