Crystallization fouling of finned tubes during pool boiling: effect of fin density

Esawy, M.; Malayeri, M.R.; Müller‐Steinhagen, Hans

doi:10.1007/s00231-010-0690-7

Cited by 17 publications

(7 citation statements)

References 10 publications

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“…and present results for atmospheric pressure have been compared with the experimental data by Esawy et al [ 26 ] recorded for distilled water boiling on a smooth horizontal stainless steel tube of almost the same diameter (12.7 mm) heated by a cartridge heater. Figure 10 shows comparison of present experimental data with Cooper correlation taking heat flux density as abscissa and heat transfer coefficient as ordinate for the pool boiling of distilled water on horizontal stainless steel smooth tube.…”

Section: Resultsmentioning

confidence: 67%

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Pool boiling of water-Al2O3 and water-Cu nanofluids on horizontal smooth tubes

Cieśliński

Kaczmarczyk

2011

Nanoscale Res Lett

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Experimental investigation of heat transfer during pool boiling of two nanofluids, i.e., water-Al2O3 and water-Cu has been carried out. Nanoparticles were tested at the concentration of 0.01%, 0.1%, and 1% by weight. The horizontal smooth copper and stainless steel tubes having 10 mm OD and 0.6 mm wall thickness formed test heater. The experiments have been performed to establish the influence of nanofluids concentration as well as tube surface material on heat transfer characteristics at atmospheric pressure. The results indicate that independent of concentration nanoparticle material (Al2O3 and Cu) has almost no influence on heat transfer coefficient while boiling of water-Al2O3 or water-Cu nanofluids on smooth copper tube. It seems that heater material did not affect the boiling heat transfer in 0.1 wt.% water-Cu nanofluid, nevertheless independent of concentration, distinctly higher heat transfer coefficient was recorded for stainless steel tube than for copper tube for the same heat flux density.

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Section: Resultsmentioning

confidence: 67%

“… Variation of present results with Cooper correlation [ 25 ] and Esawy et al . experimental data [ 26 ]. …”

Section: Resultsmentioning

confidence: 99%

Pool boiling of water-Al2O3 and water-Cu nanofluids on horizontal smooth tubes

Cieśliński

Kaczmarczyk

2011

Nanoscale Res Lett

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“…Montgomery used FloTherm to computationally investigate the effect of particle deposition on the efficiency of a solid pin fin array. Esaway et al numerically investigated the effects of deposit formation on the performance of annular finned tubes during nucleate pool boiling. Aparajith et al investigated the performance of different extended surface geometries subjected to fouling.…”

Section: Introductionmentioning

confidence: 99%

Effects of particle fouling and magnetic field on porous fin for improved cooling of consumer electronics

2019

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The combined effect of particulate fouling and magnetic field on the efficiency of a convective-radiative porous fin heatsink with temperature-dependent thermal conductivity is presented. The developed thermal models are solved using differential transformation method. The effects of thermal conductivity, porosity, convection, radiation parameter, and thermal fouling number on the fin thermal efficiency are investigated. The presence of thermal fouling on the surface of the fin is shown to increase the temperature distribution. The presence of particle deposition on the fin surface significantly decreases the rate of heat transfer as additional thermal resistance of the fouling layer decreases the thermal performance of porous fin heatsink. Moreover, the fin efficiency decreases as the value of fouled Biot, Darcy, radiation number, and thermogeometric parameter increases. It is established that M f < M c , which indicates that the efficiency of the fouled fin is greater than the efficiency of the clean fin. Furthermore, the result of the present study is validated with the established results of Chebyshev spectral collocation method and fourth-order Runge-Kutta with shooting method and an error margin of 0.000000023 is established.K E Y W O R D S differential transformation method, particle fouling, porous fin, thermal analysis

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“…The general preference is to mitigate HE fouling by proper equipment design and then by online techniques. 3 Regarding mechanical aspects, the formation of deposits on finned tubes in CaSO 4 solutions was investigated, 4 showing that with increasing fin density, fouling resistance was significantly decreased. Computational fluid dynamics (CFD) simulation was applied to develop a fouling model for fluid flow in a bare tube and in a tube with inserts, allowing us to predict fouling threshold conditions for both cases.…”

Section: ■ Introductionmentioning

confidence: 99%

Dynamic Analysis of Fouling Buildup in Heat Exchangers Designed According to TEMA Standards

Carvalho

Ravagnani

2018

Ind. Eng. Chem. Res.

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The prediction of important control properties is a challenging task for shell and tube heat exchangers design. Dynamic models, which include fouling effects, are still poorly investigated in the recent literature. To study the behavior of variable conditions over time and its influence on the dynamic aspects of the system, a design approach based on TEMA standards has been proposed, aiming to analyze the process in a more realistic equipment. To study the behavior of time-varying conditions and its influence in the system dynamics, the model considered in this work is based on the idea of heat exchanger cells as the basic modeling element. This kind of approach has some advantages over the distributed model, such as continuous variables in time and discrete in space, leading to ordinary differential equations (ODE) and also providing the possibility of controlling the model complexity by adjusting the number of modeling cells. The ratio between output and input signals in each cell generates eight operator transmittances that describe the dynamic of the system. The influence of fouling in the dynamic behavior is evaluated by considering its resistance (R f) as a function of time. The model was implemented in MATLAB/Simulink and simulations have been carried out for different R f values with a step change in three input variables. Open loop responses showed that as R f increases, the quality of response is deteriorated and the system is affected mainly by the inertia and thermal exchange inefficiency.

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Crystallization fouling of finned tubes during pool boiling: effect of fin density

Cited by 17 publications

References 10 publications

Pool boiling of water-Al2O3 and water-Cu nanofluids on horizontal smooth tubes

Pool boiling of water-Al2O3 and water-Cu nanofluids on horizontal smooth tubes

Effects of particle fouling and magnetic field on porous fin for improved cooling of consumer electronics

Dynamic Analysis of Fouling Buildup in Heat Exchangers Designed According to TEMA Standards

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