Thermohydraulic maldistribution reduction in mini heat exchangers

Dąbrowski, Paweł

doi:10.1016/j.applthermaleng.2020.115271

Cited by 18 publications

(7 citation statements)

References 39 publications

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“…With the increase of the pressure loss, the rate of the specific energy dissipation (E d ) increases in a millichannel-based device, as shown in Equation (21). where,…”

Section: Velocity Distribution Modelmentioning

confidence: 99%

“…Song et al 20 mitigated the flow mal‐distribution in a rectangular or trapezoidal header by installing 10 separate arrays and spacing of pin fins and proposed the best arrangement. Dabrowski 21 incorporated a small threshold (0.5 mm) in front of parallel channels in a header and observed that flow mal‐distribution was decreased significantly. Kockmann 22 stated that the milli‐ or micro‐multichannel geometries in parallel orientations are more effective than their series.…”

Section: Introductionmentioning

confidence: 99%

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Mixing characteristics for the single and air‐water two‐phase flows in miniaturized parallel multichannel‐based devices

Mondal

Majumder

2022

AIChE Journal

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Investigation on the miniaturized parallel multichannel‐based devices packed with glass beads to improve the mass exchange execution is the critical focal point of the current study. One of the essential parameters to specify the miniaturized devices' flow distribution is the residence time distribution (RTD). In the present context, the RTDs of a liquid tracer were investigated for the air‐water multiphase flows (concurrent) across the multichannel‐based miniaturized devices (comprising of 11 similar dimensional parallel channels). The devices were variable in height and packed with glass beads. The conductivity estimations generated the RTD curves and were addressed by the axial dispersion model (ADM). The fluid‐flow rates differed within the range of 5–23 ml min−1. The axial dispersion coefficients and the rate of the specific energy dispersion were investigated. The effects of pressure difference and geometry on the hydrodynamic attributes and mixing properties were well‐illustrated, and the new correlations were suggested.

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“…With the increase of the pressure loss, the rate of the specific energy dissipation (E d ) increases in a millichannel-based device, as shown in Equation (21). where,…”

Section: Velocity Distribution Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mixing characteristics for the single and air‐water two‐phase flows in miniaturized parallel multichannel‐based devices

Mondal

Majumder

2022

AIChE Journal

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“…Both approaches are based on prior understanding of fluid flow and heat transfer in macrochannels and are therefore valid only if the liquid flow in microchannels follows the same conservations laws as in macrochannels. The deviation reported in the parallel microchannel heat exchanger is due to experimental accuracy and the assumption of a uniform flow distribution in the data reduction model [3] and the maldistribution phenomenon is not examined well enough [4]. For example, a disagreement of the friction factor values reported in multiple microchannels may be due to the existence of a flow maldistribution in multiple microchannels [5][6].…”

Section: Introductionmentioning

confidence: 99%

Flow Distribution in Parallel Rectangular Multi Microchannels in Single Phase

Sahar

Wissink²,

Mahmoud³

et al. 2023

CFDL

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This study proposed newly designed inlet manifolds to manage non-uniformity in parallel multi microchannel heat sink by introducing edges with a curved shape were introduced in order to reduce flow-recirculation at the sharp edges. This resulted in a better flow distribution in the parallel channels. A comprehensible numerical study has been performed using ANSYS-Fluent and a three-dimensional computational domain, incorporating the effect of conjugated heat transfer, was employed in this study. R134a was used as the working fluid and copper was selected as the heat sink material. The dimensionless channel flow ratio and flow maldistribution factor were introduced to quantify the flow distribution inside individual channels and the uniformity of this flow distribution. A uniform flow distribution is achieved when the maldistribution factor value approaches 0.

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“…Investigations into minigaps of different geometries (e.g., rectangular [21] or annular [22]) usually focus on the thermal performance (e.g., local heat transfer coefficients [23], Nusselt number [24], or temperature distribution [25]). Flow distribution in minigaps is discussed rarely, and if so, then usually as a side experimental observation [26] or in the form of numerical analyses using computational fluid dynamics (CFD) [27]. Several studies have also compared the performance of both mini-scale applications, i.e., minichannels and minigaps.…”

Section: Introductionmentioning

confidence: 99%

Experimentally Verified Flow Distribution Model for a Composite Modelling System

Fialová

Jegla

2021

Energies

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Requirements of modern process and power technologies for compact and highly efficient equipment for transferring large heat fluxes lead to designing these apparatuses as dense parallel flow systems, ranging from conventional to minichannel dimensions according to the specific industrial application. To avoid operating issues in such complex equipment, it is vital to identify not only the local distribution of heat flux in individual parts of the heat transfer surface but also the uniformity of fluid flow distribution inside individual parallel channels of the flow system. A composite modelling system is currently being developed for accurate design of such complex heat transfer equipment. The modeling approach requires a flow distribution model enabling to yield accurate-enough predictions in reasonable time frames. The paper presents the results of complex experimental and modeling investigation of fluid flow distribution in dividing headers of tubular-type equipment. Different modeling approaches were examined on a set of header geometries. Predictions obtained via analytical and numerical models were validated using data from the experiments conducted on additively manufactured header samples. Two case studies employing parallel flow systems (mini-scale systems and a conventional-size heat exchanger) demonstrated the applicability of the distribution model and the accuracy of the composite modelling system.

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Thermohydraulic maldistribution reduction in mini heat exchangers

Cited by 18 publications

References 39 publications

Mixing characteristics for the single and air‐water two‐phase flows in miniaturized parallel multichannel‐based devices

Mixing characteristics for the single and air‐water two‐phase flows in miniaturized parallel multichannel‐based devices

Flow Distribution in Parallel Rectangular Multi Microchannels in Single Phase

Experimentally Verified Flow Distribution Model for a Composite Modelling System

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