Transition of convective heat transfer to subcooled flow boiling due to crystallization fouling

Abd-Elhady, M.S.; Malayeri, M.R.

doi:10.1016/j.applthermaleng.2015.09.093

Cited by 28 publications

(2 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Crystallization fouling is more severe if boiling is present because of bubble formation mechanisms, which can increase the local salt concentration near the heat transfer surface by several orders of magnitude. The transition into nucleate boiling can sometimes be caused by the fouling process itself because of increasing surface temperatures as a result of the formed deposit, as shown by Abd-Elhady et al [63]. They studied the effects of CaSO 4 crystallization fouling and conducted several experiments at constant heat flux conditions that have shown an increase in surface temperature above boiling point because of scaling, leading to nucleation of bubbles.…”

Section: Boilingmentioning

confidence: 99%

A Review of Crystallization Fouling in Heat Exchangers

et al. 2021

View full text Add to dashboard Cite

A vast majority of heat exchangers suffer from unwanted deposition of material on the surface, which severely inhibits their performance and thus marks one of the biggest challenges in heat transfer. Despite numerous scientific investigations, prediction and prevention of fouling remain unresolved issues in process engineering and are responsible for large economic losses and environmental damage. This review article focuses specifically on crystallization fouling, providing a comprehensive overview of the state-of-the-art of fouling in heat exchangers. The fundamentals of the topic are discussed, as the term fouling resistance is introduced along with distinct fouling behaviour, observed in laboratory and industrial environments. Insight into subsequent phases of the fouling process is provided, along with the accompanying microscale events. Furthermore, the effects of fluid composition, temperature, flow velocity, surface condition, nucleate boiling and composite fouling are comprehensively discussed. Fouling modelling is systematically reviewed, from the early work of Kern and Seaton to recently used artificial neural networks and computational fluid dynamics. Finally, the most common fouling mitigation approaches are presented, including design considerations and various on-line strategies, as well as off-line cleaning. According to our review, several topics require further study, such as the initial stage of crystal formation, the effects of ageing, the interplay of two or more fouling mechanisms and the underlying phenomena of several mitigation strategies.

show abstract

Section: Boilingmentioning

confidence: 99%

A Review of Crystallization Fouling in Heat Exchangers

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Heat is now required to be conducted from the wall across the growing and increasingly thicker deposit layer before transferring to the flowing fluids. Engineering examples include wax deposition in oil-gas [2,3] and oil-water [4,5] flows, asphaltene deposition in oil-water [6] and oil-gas (CO2) [7] flows, hydrate deposition in water-gas flow [8,9], fouling in two-phase heat exchanger [10] and fouling in flow boiling [11,12].…”

mentioning

confidence: 99%

Conjugate heat transfer in stratified two-fluid flows with a growing deposit layer

Yap²,

Lou

et al. 2017

Applied Thermal Engineering

View full text Add to dashboard Cite

The article presents a numerical model for moving boundary conjugate heat transfer in stratified twofluid flows with a growing deposit layer. The model is applicable to other general moving boundary conjugate heat transfer problem in a two-fluid flow environment with deposition occurring simultaneously. The level-set method is adopted to capture the fluid-fluid interface and fluid-deposit front. The governing equations are solved using a finite volume method. Upon verification of the model, the effects of inlet velocity ratio, Damköhler number and thermal conductivity ratio on the flow, deposition as well as heat transfer are investigated. Generally, Nusselt number on the lower wall, Nulx and upper wall, Nuux show distinct features with the change of these parameters. Nuux increases with the increase of fluid 1 inlet velocity and the thermal conductivity of deposit layer, respectively. While it decreases with the increase of Damkholer number. Unlike the variation trend of Nuux, Nulx varies differently in the upstream and downstream along the channel, respectively under these parameters. A high fluid 1 velocity and a high thermal conductivity of deposit layer have a high Nulx upstream and a low Nulx downstream. However, a high Damkholer number results in a low Nulx upstream and a high Nulx downstream.

show abstract

Basic Concepts of Fouling in Heat Transfer System

Varnaseri,

Peyghambarzadeh

2024

Scale Formation in Heat Exchangers

View full text Add to dashboard Cite

Transition of convective heat transfer to subcooled flow boiling due to crystallization fouling

Cited by 28 publications

References 17 publications

A Review of Crystallization Fouling in Heat Exchangers

A Review of Crystallization Fouling in Heat Exchangers

Conjugate heat transfer in stratified two-fluid flows with a growing deposit layer

Basic Concepts of Fouling in Heat Transfer System

Contact Info

Product

Resources

About