Influence of obstacles on the wall heat transfer for 2D and 3D helically ribbed pipes

Virgilio, Marco; Mayo, Ignacio; Dedeyne, Jens; Marin, Guy; Arts, Tony

doi:10.1016/j.ijheatmasstransfer.2019.119087

Cited by 9 publications

(9 citation statements)

References 25 publications

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“…Increasing the Re number leads to a proportional increase in Nu number for both the bare tube and ribbed tube, Therefore, no major changes are found in the relative heat transfer enhancement Nu/Nu 0 with increasing Re number. This is consistent with the experimental findings reported by Virgilio et al for both continuously and discontinuously ribbed tubes 23 …”

Section: Resultssupporting

confidence: 94%

“…The experimental conditions are listed in Table 1. For a more detailed description of the experimental setup and methodology, the reader is referred to the works of Mayo et al 19 and Virgilio et al 22,23 The obtained experimental data is used to validate the corresponding numerical simulations, which will be described in the following section.…”

Section: Methodsmentioning

confidence: 99%

“…Following the similar experimental techniques adopted by Mayo et al, 19 Virgilio et al performed two types of experiment for high fidelity flow and heat transfer data. 22,23 One is a stereo-particle image velocimetry (S-PIV) setup (see Figure 1), capturing mean flow velocities as well as turbulence statistics in three spatial coordinates. The test tube is made of acrylic glass to provide full optical access to the region of interest (ROI).…”

Section: Methodsmentioning

confidence: 99%

“…10,[16][17][18] Experimental work has been performed to acquire the thermal and/or hydrodynamic behavior of diverse ribbed tubes. [19][20][21][22][23] Experimental studies offer valuable insight into flow behavior, however, given the wide range of possible geometries, it is impractical to set up an experimental campaign for each geometry to assess the impact of each geometrical parameter. Therefore, reactor designs are mainly compared and optimized by means of numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

“…First, the simulation of a discontinuously ribbed tube is elaborately validated by comparison with a high-quality dataset from the von Karman Institute (VKI) for fluid dynamics. 22,23 Subsequently, the validated simulation framework is used to investigate the effects of the continuity of the rib on flow and thermal behavior, and to clarify the inherent connection between flow behavior and heat transfer. At last, a detailed comparison between six discontinuously ribbed designs is performed in terms of pressure drop and heat transfer.…”

Section: Introductionmentioning

confidence: 99%

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Wall‐resolved large eddy simulation of turbulent flows in helically ribbed steam cracker reactors

2022

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Helically ribbed coils are commonly applied in steam cracking furnaces. To fully understand the impact of these ribbed wall modifications on the local heat transfer and associated pressure drop throughout the reactor, detailed experimental, and numerical studies have been performed. Experimental data based on stereo-particle image velocimetry (S-PIV) and liquid crystal thermography have been used to validate the numerical results from wall-resolved large eddy simulations using OpenFOAM.The validation shows an excellent agreement in terms of mean and fluctuating velocities, pressure drop, and heat transfer behavior in a discontinuously ribbed tube. Compared with the pressure drop in a continuously ribbed tube, an approximately 40% lower pressure drop is obtained with a discontinuously ribbed tube, at the cost of a slightly decreased heat transfer enhancement. This makes the discontinuously ribbed tube design particularly interesting for steam cracking applications. The results also show that the nonuniform heat transfer at the wall is inherently linked to the flow reattachment and recirculation zones caused by the rib. Finally, the validated numerical model was used to study comparable designs and propose novel helical rib designs. Based on the results of the study, enlarging the trailing edge of the conventional ribbed geometry will improve the thermal enhancement performance, and is therefore found most promising for steam cracking reactor design.

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Section: Resultssupporting

confidence: 94%