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Deposition of dry particles on a fin-and-tube heat exchanger by a coupled soft-sphere DEM and CFD

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Deposition of dry particles on a fin-and-tube heat exchanger by a coupled soft-sphere DEM and CFD. / Välikangas, Turo; Hærvig, Jakob; Kuuluvainen, Heino; Dal Maso, Miikka; Peltonen, Petteri; Vuorinen, Ville.

In: International Journal of Heat and Mass Transfer, 2019.

Research output: Contribution to journalArticleScientificpeer-review

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Välikangas, T., Hærvig, J., Kuuluvainen, H., Dal Maso, M., Peltonen, P., & Vuorinen, V. (2019). Deposition of dry particles on a fin-and-tube heat exchanger by a coupled soft-sphere DEM and CFD. International Journal of Heat and Mass Transfer, [119046]. https://doi.org/10.1016/j.ijheatmasstransfer.2019.119046

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Välikangas, Turo ; Hærvig, Jakob ; Kuuluvainen, Heino ; Dal Maso, Miikka ; Peltonen, Petteri ; Vuorinen, Ville. / Deposition of dry particles on a fin-and-tube heat exchanger by a coupled soft-sphere DEM and CFD. In: International Journal of Heat and Mass Transfer. 2019.

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@article{91a1bc098533430184be1c03b99223fc,
title = "Deposition of dry particles on a fin-and-tube heat exchanger by a coupled soft-sphere DEM and CFD",
abstract = "In this study, a novel computational model is utilized for investigating fouling of two commonly encountered heat exchanger fin shapes in an air-conditioning application. The computational method utilizes the discrete element method (DEM) coupled with a large-eddy simulation (LES) framework. The fin-and-tube heat exchangers (FTHE) are investigated for three different Reynolds numbers (ReDh =243, 528, 793), three different particle sizes (Dp= 5, 10, 20 µm) and two different adhesive particle types based on the experimental values in the literature. The code is first benchmarked from the CFD and DEM viewpoints. A comprehensive fouling study of the FTHE's, consisting of altogether 36 simulations, is then carried out. The major numerical findings of the paper consist of the following four features. First, with low adhesive particles, the plain fin shape has a 3.45 higher volume fouling rate with ReDh =793 than at ReDh =264. With the herringbone fin shape, and the low adhesive particles, the volume fouling rate is 1.76 higher with ReDh =793 than at ReDh =264. Second, for the high adhesive particles, the plain fin has a 5.4 times higher volume fouling rate at ReDh =793 than for ReDh =264. The herringbone fin shape has a 3.92 times higher volume fouling rate with the highest Reynolds number of ReDh =793 compared to ReDh =264. Third, high adhesive particles have 3.0 times higher volume fouling rate than low adhesive particles for both fin shapes, all particle sizes and all Reynolds numbers combined. And finally, herringbone fins have 1.74 times higher volume fouling rate than plain fins for low adhesive particles. For high adhesive particles, herringbone has 1.8 times higher volume fouling rate and when both particle types are summed together, herringbone has a 1.78 times higher volume fouling rate than the plain fin shape. As a major finding of the study, the high adhesive particle collection efficiency increases monotonously with the Stokes and Reynolds numbers while low adhesive particle collection efficiency poses a non-monotonous trend.",
keywords = "CFD-DEM, Dry-particle, Fin-and-tube heat exchanger, Fouling, Herringbone fin, Large-eddy simulation, Plain fin, Soft sphere",
author = "Turo V{\"a}likangas and Jakob H{\ae}rvig and Heino Kuuluvainen and {Dal Maso}, Miikka and Petteri Peltonen and Ville Vuorinen",
year = "2019",
doi = "10.1016/j.ijheatmasstransfer.2019.119046",
language = "English",
journal = "International Journal of Heat and Mass Transfer",
issn = "0017-9310",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Deposition of dry particles on a fin-and-tube heat exchanger by a coupled soft-sphere DEM and CFD

AU - Välikangas, Turo

AU - Hærvig, Jakob

AU - Kuuluvainen, Heino

AU - Dal Maso, Miikka

AU - Peltonen, Petteri

AU - Vuorinen, Ville

PY - 2019

Y1 - 2019

N2 - In this study, a novel computational model is utilized for investigating fouling of two commonly encountered heat exchanger fin shapes in an air-conditioning application. The computational method utilizes the discrete element method (DEM) coupled with a large-eddy simulation (LES) framework. The fin-and-tube heat exchangers (FTHE) are investigated for three different Reynolds numbers (ReDh =243, 528, 793), three different particle sizes (Dp= 5, 10, 20 µm) and two different adhesive particle types based on the experimental values in the literature. The code is first benchmarked from the CFD and DEM viewpoints. A comprehensive fouling study of the FTHE's, consisting of altogether 36 simulations, is then carried out. The major numerical findings of the paper consist of the following four features. First, with low adhesive particles, the plain fin shape has a 3.45 higher volume fouling rate with ReDh =793 than at ReDh =264. With the herringbone fin shape, and the low adhesive particles, the volume fouling rate is 1.76 higher with ReDh =793 than at ReDh =264. Second, for the high adhesive particles, the plain fin has a 5.4 times higher volume fouling rate at ReDh =793 than for ReDh =264. The herringbone fin shape has a 3.92 times higher volume fouling rate with the highest Reynolds number of ReDh =793 compared to ReDh =264. Third, high adhesive particles have 3.0 times higher volume fouling rate than low adhesive particles for both fin shapes, all particle sizes and all Reynolds numbers combined. And finally, herringbone fins have 1.74 times higher volume fouling rate than plain fins for low adhesive particles. For high adhesive particles, herringbone has 1.8 times higher volume fouling rate and when both particle types are summed together, herringbone has a 1.78 times higher volume fouling rate than the plain fin shape. As a major finding of the study, the high adhesive particle collection efficiency increases monotonously with the Stokes and Reynolds numbers while low adhesive particle collection efficiency poses a non-monotonous trend.

AB - In this study, a novel computational model is utilized for investigating fouling of two commonly encountered heat exchanger fin shapes in an air-conditioning application. The computational method utilizes the discrete element method (DEM) coupled with a large-eddy simulation (LES) framework. The fin-and-tube heat exchangers (FTHE) are investigated for three different Reynolds numbers (ReDh =243, 528, 793), three different particle sizes (Dp= 5, 10, 20 µm) and two different adhesive particle types based on the experimental values in the literature. The code is first benchmarked from the CFD and DEM viewpoints. A comprehensive fouling study of the FTHE's, consisting of altogether 36 simulations, is then carried out. The major numerical findings of the paper consist of the following four features. First, with low adhesive particles, the plain fin shape has a 3.45 higher volume fouling rate with ReDh =793 than at ReDh =264. With the herringbone fin shape, and the low adhesive particles, the volume fouling rate is 1.76 higher with ReDh =793 than at ReDh =264. Second, for the high adhesive particles, the plain fin has a 5.4 times higher volume fouling rate at ReDh =793 than for ReDh =264. The herringbone fin shape has a 3.92 times higher volume fouling rate with the highest Reynolds number of ReDh =793 compared to ReDh =264. Third, high adhesive particles have 3.0 times higher volume fouling rate than low adhesive particles for both fin shapes, all particle sizes and all Reynolds numbers combined. And finally, herringbone fins have 1.74 times higher volume fouling rate than plain fins for low adhesive particles. For high adhesive particles, herringbone has 1.8 times higher volume fouling rate and when both particle types are summed together, herringbone has a 1.78 times higher volume fouling rate than the plain fin shape. As a major finding of the study, the high adhesive particle collection efficiency increases monotonously with the Stokes and Reynolds numbers while low adhesive particle collection efficiency poses a non-monotonous trend.

KW - CFD-DEM

KW - Dry-particle

KW - Fin-and-tube heat exchanger

KW - Fouling

KW - Herringbone fin

KW - Large-eddy simulation

KW - Plain fin

KW - Soft sphere

U2 - 10.1016/j.ijheatmasstransfer.2019.119046

DO - 10.1016/j.ijheatmasstransfer.2019.119046

M3 - Article

JO - International Journal of Heat and Mass Transfer

JF - International Journal of Heat and Mass Transfer

SN - 0017-9310

M1 - 119046

ER -