Frictional and Heat Transfer Characteristics of Flow in Triangle and Hexagon Channels of Wall-Flow Monoliths

Wang, Wen; Bissett, Edward J.

doi:10.1007/s40825-018-0093-7

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…Considering the scenario of laminar flow, the static pressure remains constant during the first section of the domain as a result of the flat velocity profile at the inlet and negligible viscous losses in the open section before the substrate. Then, flow collides with the frontal face of the substrate, where the flow area is reduced; as a consequence, there are some non-linear head losses, as expected in flow-through and wall-flow monoliths [59][60][61][62][63]. Inside of Channel 1, the boundary layer develops rapidly, and losses from friction between flow lamina become linear in the fully developed zone.…”

Section: Pressure Profile and Back Pressure Through The Substratesmentioning

confidence: 99%

Transition of the Flow Regime Inside of Monolith Microchannel Reactors Fed with Highly Turbulent Flow

2023

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This paper investigates the flow behaviour of monolith microchannels. Specifically, the study characterizes the flow regime within in-series monolith channels where highly turbulent flow approaches them but inside of the channels, the Reynolds number is subcritical. Results from LES and a transitional RANS model are compared to those obtained when directly assuming laminar flow inside of the channels. A space-resolved model of channels placed in series and channel Reynolds numbers ranging from 50 to 300 are considered. The results show that the flow pattern in is almost identical in the two channels and that the frequency of fluctuations tends to increase with the Reynolds number. The flow regime in both channels is unsteady laminar, containing a wide spectrum of frequencies. The tested transitional RANS model (k-kL-ω) is unable to capture the velocity fluctuations predicted by LES. Despite the differences in the velocity field prediction, the pressure drop estimation from all models is practically the same. This study provides insights into the flow behaviour of monolith reactors and is useful for reactor design and optimization.

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Section: Pressure Profile and Back Pressure Through The Substratesmentioning

confidence: 99%

Transition of the Flow Regime Inside of Monolith Microchannel Reactors Fed with Highly Turbulent Flow

2023

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“…Flows around tube bundles with a large number of tubes, on the other hand, have been the subject of a great deal of experimental and numerical efforts. The in-line [7,8], staggered [9][10][11], rotating square [12], regular triangle [13,14], and parallel triangle [15] are a few of the array designs that were investigated by researchers. The worldwide waste heat recovery market is being boosted by thermal industries such as petrochemical plants.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on The Performance of One-Directional and Bi-Directional Flow Conditions Across In-Line Tube Banks Heat Exchanger

Hasbullah

Saat

Anuar

et al. 2022

ARFMTS

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The one-directional flow condition and the bi-directional flow condition are two flow conditions that can be found in many energy systems depending on the nature of the flow and the working mechanism of the system. This paper reports the differences in heat transfer performance for an in-line tube banks heat exchanger that is placed in the one-directional and the bi-directional flow conditions. The experiments involve the use of a blower as a flow inducer for one-directional flow while a loudspeaker with a constant frequency of 14.2 Hz is used as a flow inducer for bi-directional flow condition. A quarter wavelength resonator with 4 mm wall thickness and a length of 6600 mm was used in the investigation. The results of velocity and temperature were recorded using a hotwire anemometer and a type-K thermocouple, respectively. Results show that the behaviour of velocity and temperature in one-directional and the bi-directional flow conditions over an in-line heated tube banks are different with a maximum difference of 52 % for velocity and 79 % for temperature.

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“…Alternatives to square channel cross-section designs have also been shown to reduce ash-induced pressure drop e.g. hexagonal and octo-square geometries [33]. The engine system operation may also be optimised to minimise the impact of ash deposits by modifying the distribution and properties of the ash within a filter [15].…”

Section: Introductionmentioning

confidence: 99%

Modelling Investigation of the Thermal Treatment of Ash-Contaminated Particulate Filters

Lao

Akroyd

Smith

et al. 2021

Emiss. Control Sci. Technol.

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This paper investigates the impact of thermal treatment on the pressure drop of particulate filters containing ash deposits. A one-dimensional model has been developed and applied to describe the deposition of soot and ash particles, and estimate the spatial distribution of the deposits in such filters. Phenomenological models have been developed to describe the potential sintering and cracking of the ash deposits caused by thermal treatment of the filter. The model results are in good agreement with experimental measurements of the reduction in the pressure drop in thermally treated filters. It was found that crack formation in the ash layer can lead to significant reduction of the pressure drop at relatively low temperatures. Sintering of ash deposits in the wall and the ash plug also contributes towards a decrease in filter pressure drop at higher temperatures. This work is the first attempt to model the impact of the thermal treatment of ash in particulate filters in order to support the development of future ash management strategies. The cracking of the ash layer during the thermal treatment has been identified to be the most critical effect for pressure drop reduction.

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Frictional and Heat Transfer Characteristics of Flow in Triangle and Hexagon Channels of Wall-Flow Monoliths

Cited by 7 publications

References 16 publications

Transition of the Flow Regime Inside of Monolith Microchannel Reactors Fed with Highly Turbulent Flow

Transition of the Flow Regime Inside of Monolith Microchannel Reactors Fed with Highly Turbulent Flow

Experimental Study on The Performance of One-Directional and Bi-Directional Flow Conditions Across In-Line Tube Banks Heat Exchanger

Modelling Investigation of the Thermal Treatment of Ash-Contaminated Particulate Filters

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