Friction factors of power-law fluids in chevron-type plate heat exchangers

Fernandes, Carla S.; Dias, Ricardo P.; Nóbrega, J. M.; Maia, João M.

doi:10.1016/j.jfoodeng.2008.05.022

Cited by 26 publications

(15 citation statements)

References 32 publications

(72 reference statements)

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“…The confocal micro-PIV system was first evaluated by comparing the experimental results not only with a well established analytical solution for steady flow in a rectangular microchannel [15] but also with a reliable numerical method that was used in past investigations to study the flow behaviour of Newtonian or non-Newtonian fluids at low Reynolds numbers [9,10]. The numerical, experimental and analytical results of the present work were obtained for the middle plane (25 m height) of the rectangular microchannel.…”

Section: Resultsmentioning

confidence: 99%

“…The size of the elements was fixed after a grid independence test. The grids were successively refined and the velocity obtained with the different meshes were compared, the results being considered independent of the mesh when a difference bellow 1% was achieved [4,[8][9][10].…”

Section: Simulation Methodsmentioning

confidence: 99%

“…For the velocity field, the modification on each node between two consecutive iterations is compared to the value of the velocity at the current iteration. In the present work, the convergence value was set to 10 4 , since this value is appropriate for the studied problem [5,[8][9][10]. The boundary conditions were established in order to reproduce the experimental conditions.…”

Section: Simulation Methodsmentioning

confidence: 99%

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Microscale Flow Dynamics of Red Blood Cells in Microchannels: An Experimental and Numerical Analysis

Lima

Fernandes

Dias

et al. 2010

Computational Methods in Applied Sciences

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The book collects the state-of-the-art research, methods and new trends on the subject of computational vision and medical image processing contributing to the development of these knowledge areas. PrefaceNowadays, computational methodologies of signal processing and imaging analysis for 2D, 3D and even 4D data are commonly used for various applications in society. For example, Computational Vision systems are progressively used for surveillance tasks, traffic analysis, recognition process, inspection purposes, human-machine interfaces, 3D vision and deformation analysis.One of the main characteristics of the Computational Vision domain is its intermultidisciplinary nature. In fact, in this domain, methodologies of several other fundamental sciences, such as Informatics, Mathematics, Statistics, Psychology, Mechanics and Physics are regularly used. Besides this inter-multidisciplinary characteristic, one of the main rationale that promotes the continuous effort being made in this area of human knowledge is the number of applications in the medical area. For instance, statistical or physical procedures on medical images can be used in order to model the represented structures. This modelling can have different goals, for example: shape reconstruction, segmentation, registration, behavioural interpretation and simulation, motion and deformation analysis, virtual reality, computer-assisted therapy or tissue characterization.The main objective of the ECCOMAS Thematic Conferences on Computational Vision and Medical Image Processing (VIPimage) is to promote a comprehensive forum for discussion on the recent advances in the related fields and try to identify areas of potential collaboration between researchers of different sciences.This book contains the extended versions of nineteen papers selected from works presented at the second ECCOMAS thematic conference on Computational Vision and Medical Image processing (VIPimage 2009), which was held at the Engineering Faculty of the University of Porto, Portugal. It gathers together the state-of-the-art on the subject of Computational Vision and Medical Image processing contributing to the development of these knowledge areas and showing new trends in these fields.The Editors would like to take this opportunity to thank to the European Community on Computational Methods in Applied Sciences, the Abstract The blood flow dynamics in microcirculation depends strongly on the microvascular networks composed with short irregular vessel segments which are linked by numerous bifurcations. This paper presents the application of a confocal micro-PTV system to track RBCs through a rectangular polydimethysiloxane (PDMS) microchannel with a bifurcation. By using a confocal micro-PTV system, we have measured the effect of bifurcation on the flow behaviour of both fluorescent particles diluted in pure water and RBCs in concentrated suspensions. After performing simulations with the commercial finite element software package POLYFLOW R , some experimental results were compared with the nume...

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Section: Resultsmentioning

confidence: 99%

Section: Simulation Methodsmentioning

confidence: 99%

Section: Simulation Methodsmentioning

confidence: 99%

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Microscale Flow Dynamics of Red Blood Cells in Microchannels: An Experimental and Numerical Analysis

Lima

Fernandes

Dias

et al. 2010

Computational Methods in Applied Sciences

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“…The pressure drops due to bend, sudden contraction and sudden expansion at inlet and outlets, respectively, have been calculated by using the following formula: (6) Where is the total pressure loss coefficient of the bend, sudden contraction and sudden expansion at the inlet and outlet of the ports. The pressure drop due to friction in the small steel connecting pipe at the inlet and outlet of the plate heat exchanger was estimated on the basis of the smooth steel tube friction factor and pipe flow velocity as (7) The pressure drop due to friction in the corrugated passage is calculated based on the flow rate by using an empirical formula:…”

Section: Mathematical Analysismentioning

confidence: 99%

“…The studied low corrugation angle plates have been used for different number of channels, namely, 20 and 80. Fernandes et al [6] have been numerically studied the geometry of the channels for laminar flows of Newtonian and power-law fluids through cross-corrugated chevron type plate heat exchangers (PHEs). The plates area enlargement factor was a typical one (1.17), the corrugation angle, β, varied between 30 and 60 and the flow index behavior, n, between 0.25 and 1.…”

Section: Introductionmentioning

confidence: 99%

Analytical Studies on the Hydraulic Performance of Chevron Type Plate Heat Exchanger

Kumar¹,

Singh²

2015

IJHT

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The results of analytical studies on the hydraulic performance of chevron type plate heat exchanger for different aspect ratios, Reynolds number, maldistribution parameters, no of channels, fixed port size, and flow rates using water as the working fluid in the channels have been presented. Some analytical results have been validated with the experimental results available in the literature. Pressure drop in the heat exchanger is found to depend on flow rate, numbers of channels and aspect ratio. Friction factor in a channel also depends on flow rate of fluid and aspect ratio. The flow distribution and pressure drop in the U-type arrangement plate heat exchangers are studied for a wide range of Reynolds number (200-5800). The flow maldistribution brings about an increase in pressure drop across the heat exchanger.

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A New Extensional Mixing Element for Improved Dispersive Mixing in Twin‐Screw Extrusion, Part 1: Design and Computational Validation

2015

Self Cite

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Twin‐screw extruders (TSE) are typically the equipment of choice in polymer blending and compounding operations due to the relatively high stresses and controllable residence times they impart on the melts. However, the mixing action is shear dominated and shear flows are energetically inefficient for dispersive mixing by comparison with extensional flows. We present a new extensional mixing element (EME), developed as a static dispersive mixing element for TSEs with dispersive mixing provided by extension‐dominated flow through stationary hyperbolically contracting channels. In Part 1 of the work, we present the design and show, experimentally and computationally, that the EME effectively imparts extension‐dominated flow through its channels. We also show that the flow is fully developed throughout most of the EME sections, with only small inlet transients being observed, and that it is possible to predict the real pressure drop in the system. Experimental validation of the EME for immiscible blends of varying viscosity ratios will be discussed in Part 2.

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Friction factors of power-law fluids in chevron-type plate heat exchangers

Cited by 26 publications

References 32 publications

Microscale Flow Dynamics of Red Blood Cells in Microchannels: An Experimental and Numerical Analysis

Microscale Flow Dynamics of Red Blood Cells in Microchannels: An Experimental and Numerical Analysis

Analytical Studies on the Hydraulic Performance of Chevron Type Plate Heat Exchanger

A New Extensional Mixing Element for Improved Dispersive Mixing in Twin‐Screw Extrusion, Part 1: Design and Computational Validation

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