Numerical investigation on prevention of fouling in the horizontal tube heat exchanger: Particle distribution and pressure drop

Qi, Guopeng; Jiang, Feng

doi:10.1016/j.desal.2015.03.038

Cited by 24 publications

(4 citation statements)

References 18 publications

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“…Fouling in crude preheat train heat exchangers in refineries is a complex phenomenon [1][2][3]. The particles distribution and pressure drop in a liquidsolid fluidized bed heat exchanger was studied through CFD simulations [4]. Volume-of-Fluid based Eulerian multiphase fluid model was used to analyse the flow of liquid-solid in the heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Crude Oil Fouling in Heat Exchangers: A Study on Effects of Influencing Forces

2021

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One of the major concerns in petroleum refinery preheat trains is identified as fouling. Fouling impacts the refinery economics and environment heavily. Various approaches to mitigate fouling have not yielded the desired results. This is due to lack of understanding on the effect of influencing forces on crude oil fouling in heat exchangers. Therefore, this study attempts to investigate the effects of various forces such as gravity, Saffman Lift, drag and thermophoretic on crude oil fouling in heat exchangers through Computational Fluid Dynamics (CFD) simulations. From the simulations, it is observed that the higher particle size and particle concentration resulted in higher deposition of particles. Deposition velocities increase for larger sized particles and decrease for small and medium sized particles. The Increased flow velocities and surface roughness increases wall shear and mitigate fouling. Lower temperature gradients at the heat exchanger surface decreases deposition rates due to high thermophoretic forces. The mass deposition rate is reduced by 10.3 and 16.9% with 0.03 and 0.05 Pa, respectively, for 0.14 m/s flow velocity. Also, the mass deposition rate is reduced by 15.6 and 25.1% with 0.03 and 0.05 Pa, respectively, for 0.47 m/s flow velocity. With increased surface roughness from 0.03 to 0.05 mm, the mass deposition rate is reduced by 11.48 and 19.18%, respectively, for 0.14 m/s flow velocity. Also, for 0.47 m/s flow velocity, the mass deposition rate is reduced by 18.84 and 32.92% for 0.03- and 0.05-mm surface roughness, respectively.

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Section: Introductionmentioning

confidence: 99%

Crude Oil Fouling in Heat Exchangers: A Study on Effects of Influencing Forces

2021

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“…Another main critical outcome of long-term particulate fouling is clogging due to the agglomeration and clustering of nanoparticles. On the other hand, the pressure drop and friction factor, if the volume fraction and size of nanoparticles exceed optimal values, tend to rise [20][21][22][23], leading to an enhancement of pumping power demand [24].…”

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confidence: 99%

Fouling Behavior and Dispersion Stability of Nanoparticle-Based Refrigeration Fluid

et al. 2022

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Nanofluids as heat transfer fluids have been acquiring popularity ever since their beginning. Therefore, the refrigeration research could not keep itself away from the ever-rising horizon of nanofluid applications. On the other hand, nanofluid stability remains the critical bottleneck for use. A significant reduction in nanofluids’ performance can derivate from instability phenomena. Looking to industrial applications, nanofluid long-term stability and reusability are crucial requisites. Nanoparticles’ deposits induce microchannel circuit obstruction, limiting the proper functioning of the device and negating the beneficial characteristics of the nanofluid. The aggregation and sedimentation of the particles may also determine the increased viscosity and pumping cost, and reduced thermal properties. So, there is a need to address the features of nanofluid starting from realization, evaluation, stabilization methods, and operational aspects. In this review, investigations of nanorefrigerants are summarized. In particular, a description of the preparation procedures of nanofluids was reported, followed by a deep elucidation of the mechanism of nanofluid destabilization and sedimentation, and finally, the literature results in this field were reviewed.

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“…On the other hand, although horizontal heat exchangers are reported by many studies [9,[24][25][26][27][28][29], few of them are related to a coiled heat exchanger. Most of them are horizontal ground heat exchangers [25,26], tube heat exchangers [27,28], or flat-panel heat exchangers [9,29].…”

Section: Introductionmentioning

confidence: 99%

“…Most of them are horizontal ground heat exchangers [25,26], tube heat exchangers [27,28], or flat-panel heat exchangers [9,29]. Notably, Abdel-Wahed RM et al experimentally studied a horizontal flat plated cooling surface.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on defrosting performance for an air source heat pump unit with a horizontally installed multi-circuit outdoor coil

et al. 2016

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Highlights• Negative effects due to gravity eliminated when outdoor coil horizontally installed.• Defrosting efficiency increased 9.8% after outdoor coil horizontally installed.• Defrosting efficiency decreased 6.6% when air fan reversed to blow the melted frost.• Total mass of the retained water collected decreased 222 g less after wind blowing.• Higher DEV respected better defrosting performance for multi-circuit outdoor coils. 2 AbstractWhen frost forms and accumulates over the outdoor coil's surface in an air source heat pump (ASHP) unit, system operating performance will be dramatically deteriorated.Reverse cycle defrosting is the most widely used standard defrosting method. A previous related study reported that downwards flowing of melted frost due to gravity over a vertical multi-circuit outdoor coil would decrease the reverse cycle defrosting performance. If the outdoor coil can be changed to horizontally installed, the flow path of melted frost over coil surface can be shortened, and the flow directions of refrigerant and melted frost changed from opposite to orthogonal. Consequently, a better defrosting performance is expected. In this paper, therefore, an experimental study on defrosting performance for an ASHP unit with a horizontally installed multi-circuit outdoor coil was conducted. Experimental results show that, when a vertical outdoor coil was changed to horizontally installed, the defrosting efficiency increased 9.8%, however, with the same defrosting duration at 186 s. Furthermore, when the outdoor air fan was reversed to blowing the melted frost during defrosting, the total mass of the retained water collected decreased 222 g. However, the defrosting efficiency was not increased, but decreased 6.6% because of the heat transfer enhanced between hot coil and cold ambient air.

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Numerical investigation on prevention of fouling in the horizontal tube heat exchanger: Particle distribution and pressure drop

Cited by 24 publications

References 18 publications

Crude Oil Fouling in Heat Exchangers: A Study on Effects of Influencing Forces

Crude Oil Fouling in Heat Exchangers: A Study on Effects of Influencing Forces

Fouling Behavior and Dispersion Stability of Nanoparticle-Based Refrigeration Fluid

An experimental study on defrosting performance for an air source heat pump unit with a horizontally installed multi-circuit outdoor coil

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