Flow and particle motion in scraped heat exchanger crystallizers

Pascual, Marcos Rodriguez; Derksen, J. J.; Rosmalen, G.M. van; Witkamp, G.J.

doi:10.1016/j.ces.2009.08.027

Cited by 15 publications

(2 citation statements)

References 14 publications

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“…Fitt et al [2] provide the understanding about channeling process for Newtonian fluid in a simplest model of SSHE. Pascual et al [3] studied the flow in laboratory construed SSHE and gathered great similarity with result which --------------already established through numerical computations. Smith et al [4] extended the work of Duffy et al [1], they studied the flow by taking temperature dependent viscosity.…”

Section: Introductionmentioning

confidence: 61%

Study of electro-osmotic nanofluid transport for scraped surface heat exchanger with heat transfer phenomenon

et al. 2021

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In this study a novel mathematical model for electroosmotic flow for Cu-water based nanofluid with heat transfer phenomenon is reported for scraped-surface heat exchanger. The flow is initiated due to motion of lower wall of the channel and axial pressure gradient. The flow is modelled with aid of low Reynolds number and lubrication approximation theory. Exact analytical expressions are gathered for axial velocity, and stream functions for various stations of scraped-surface heat exchanger. Physical phenomenon of electro osmotic parameter are investigated on velocity profile, velocity distribution and pressure rise at edge of the blades. It is reported that electro-osmotic parameter mainly works as dragging force, it can be used to control the flow. This controlling mechanism may be helpful in mixing different materials in scraped-surface heat exchanger. Pressure rise at edge of the blades mainly rises below the blades with electro-osmotic, whereas, this profiles is suppressed for region above the blades and between the blades.

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Section: Introductionmentioning

confidence: 61%

Study of electro-osmotic nanofluid transport for scraped surface heat exchanger with heat transfer phenomenon

et al. 2021

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“…For experimental measurements they have used an industrial SSHE with high viscous of an isotherm Newtonian or non-Newtonian product, fluid (Emkarox HV45, PolyEthylene Glycol (PEG) 35000 and shear-thinning guar gum). Pascual, M. R. et al [20] studied the SSHE for crystallization with turbulent flow and related solid particle behavior. The liquid flow was visualized by dye injection and particles monitored for two type of geometries.…”

Section: Pollack Periodica 12 2017mentioning

confidence: 99%

Horizontal scraped surface heat exchanger — Experimental measurements and numerical analysis

2017

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This paper deal with the overall heat transfer process and confrontation of experimental measurements and their numerical solutions on simplified model, inside the horizontal scraped surface heat exchanger. The experimental measurements were done on two horizontal scraped surface heat exchangers connected in series. As a product was thermally treated water, heated by vapor in the first stage and cooled by cold water in the second stage. Applied mass flow of the product: m=250, 500, 750, 1000 kgh−1 and rotary velocity of the shaft, scraper blades: rpm=20, 30, (45), 60, 90 min−1. For numerical analyses the simplified model was used, with taking only the area between the heat transfer tube, and the shaft with an aim to compare the result to experimental measurements and validate the obtained overall heat exchange, as justify the simplification. As a results from experimental measurements were obtained the correlations for Nusselt number in a form of Nu=f(Re,Pr,ηf/ηw). Based on the confrontation of results, it can be stated that the level of simplification used at numerical solutions, gives still an acceptable accuracy of overall heat transfer values. From numerical simulations were obtained further results as the velocity, temperature fields, which were used to make certain adaptation on proposed construction and their examination by additional numerical simulations. All these acquired results lead to better understanding the overall process inside the horizontal scraped surface heat exchangers and the proposed construction of mutators can increase the efficiency of heat transfer process for many products in a real processing.

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Heat and fluid flow in a scraped-surface heat exchanger containing a fluid with temperature-dependent viscosity

et al. 2010

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Scraped-surface heat exchangers (SSHEs) are extensively used in a wide variety of industrial settings where the continuous processing of fluids and fluid-like materials is involved. The steady non-isothermal flow of a Newtonian fluid with temperature-dependent viscosity in a narrow-gap SSHE when a constant temperature difference is imposed across the gap between the rotor and the stator is investigated. The mathematical model is formulated and the exact analytical solutions for the heat and fluid flow of a fluid with a general dependence of viscosity on temperature for a general blade shape are obtained. These solutions are then presented for the specific case of an exponential dependence of viscosity on temperature. Asymptotic methods are employed to investigate the behaviour of the solutions in several special limiting geometries and in the limits of weak and strong thermoviscosity. In particular, in the limit of strong thermoviscosity (i.e., strong heating or cooling and/or strong dependence of viscosity on temperature) the transverse and axial velocities become uniform in the bulk of the flow with boundary layers forming either just below the blade and just below the stationary upper wall or just above the blade and just above the moving lower wall. Results are presented for the most realistic case of a linear blade which illustrate the effect of varying the thermoviscosity of the fluid and the geometry of the SSHE on the flow

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Flow and particle motion in scraped heat exchanger crystallizers

Cited by 15 publications

References 14 publications

Study of electro-osmotic nanofluid transport for scraped surface heat exchanger with heat transfer phenomenon

Study of electro-osmotic nanofluid transport for scraped surface heat exchanger with heat transfer phenomenon

Horizontal scraped surface heat exchanger — Experimental measurements and numerical analysis

Heat and fluid flow in a scraped-surface heat exchanger containing a fluid with temperature-dependent viscosity

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