Experimental study on the bubble breakage in a stirred tank Part 2: Local dependence of breakage events

Hasan, Basim O.

doi:10.1016/j.expthermflusci.2018.02.013

Cited by 23 publications

(18 citation statements)

References 33 publications

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“…A decrease of heat transfer coefficient with oil concentration in liquid‐liquid dispersion has also been reported by Alagesan and Sundaram . The energy dissipated from the impeller and the high turbulence level associated with high Re lead to increase the breakage of oil drops and, thus, the dispersion . The increase in the breakage rate of oil drops increases the interfacial area between oil and water which in turn restrains the heat transfer.…”

Section: Resultssupporting

confidence: 57%

Oil fouling in double‐pipe heat exchanger under liquid‐liquid dispersion and the influence of copper oxide nanofluid

Majdi

Alabdly

Hasan

et al. 2019

Heat Trans. Asian Res.

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Dispersions of oil in water are encountered in a variety of industrial processes leading to a reduction in the performance of the heat exchangers when thermally treating such two phase fluids. This reduction is mainly due to changes in the thermal and hydrodynamical behavior of the two phase fluid. In the present work, an experimental investigation was performed to study the effects of light oil fouling on the heat transfer coefficient in a double-pipe heat exchanger under turbulent flow conditions. The effects of different operating conditions on the fouling rate were investigated including: hot fluid Reynolds number (the dispersion), cold fluid Reynolds number, and time. The oil fouling rate was analyzed by determining the growth of fouling resistance with time and through pressure drop measurements. The influence of copper oxide (CuO) nanofluid on the fouling rate in the dispersion was also determined. It was found that the presence of dispersed oil causes a reduction in heat transfer coefficient by percentages depending on the Reynolds number of both cold and hot fluids and the concentration of oil. In addition, the time history of fouling resistance exhibited different trends with the flow rates of both fluids and its trend was influenced appreciably by the presence of CuO nanofluid. K E Y W O R D S copper oxide, dispersion, double-pipe heat exchanger, fouling, heat transfer, nanofluid, oil Heat Transfer-Asian Res.

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Section: Resultssupporting

confidence: 57%

Oil fouling in double‐pipe heat exchanger under liquid‐liquid dispersion and the influence of copper oxide nanofluid

Majdi

Alabdly

Hasan

et al. 2019

Heat Trans. Asian Res.

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“…It has been manually validated that breakup outside this region of interest did not occur for this power input. In arrangement with Hasan this is a typical bubble trajectory. Still, an in‐depth comparison is difficult due to the different geometries and process parameters of the experimental systems and because no differentiation between bubbles trajectories, in regard to breakup or no breakup, was done.…”

Section: Resultsmentioning

confidence: 99%

“…The design is in compliance with DIN 28131, the ratio of the liquid height H to the tank diameter T is H/T = 1 and the ratio of the stirrer diameter D to the tank diameter is D/T~0. 33. Only the ratio of the clearance of the stirrer to the tank diameter is C s /T~0.29, instead of 0.33, to reduce entrained air from the liquid surface.…”

Section: Methodsmentioning

confidence: 99%

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3D Single Bubble Breakup Tracking in a Stirred Tank

Krakau

Kraume

2019

Chemie Ingenieur Technik

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A detailed understanding of turbulent fluid particle breakup mechanisms is essential for the accurate modeling of gas/liquid and liquid/liquid dispersions. The design of a fully automated setup for the three‐dimensional serial examination of the single bubble breakup process in a stirred tank, ensuring high repetition rates necessary for the additionally automated statistical analysis, is described. The implementation of a three‐dimensional automatic bubble breakup tracking tool is illustrated. At last, exemplary bubble breakup trajectories that show the benefits and limitations of the developed system and method are discussed.

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“…. Previous experiments on single fluid particle breakup have been investigated in turbulent pipe flows , orifices , extraction columns , special breakup cells , , and stirred tanks , , .…”

Section: Introductionmentioning

confidence: 99%

Three‐Dimensional Observation of Single Air Bubble Breakup in a Stirred Tank

Krakau

Kraume

2019

Chem Eng & Technol

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A fully automated three-dimensional observation of single bubble breakup trajectories in a stirred tank is demonstrated to gain unbiased and statistically relevant information about the breakup process. The mother bubble size is kept constant, independently of the stirring rate. The investigated parameter in this work is the power input. Three-dimensional bubble breakup trajectories and heat maps for the initial breakup location probability for the bottom and side views are provided. The influence of the stirrer blade angle position, at the moment of bubble detachment from the capillary, on the breakup probability is analyzed. The breakup positions are linked to the current flow field, related to the stirrer blade angle, within the tank.

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Experimental study on the bubble breakage in a stirred tank Part 2: Local dependence of breakage events

Cited by 23 publications

References 33 publications

Oil fouling in double‐pipe heat exchanger under liquid‐liquid dispersion and the influence of copper oxide nanofluid

Oil fouling in double‐pipe heat exchanger under liquid‐liquid dispersion and the influence of copper oxide nanofluid

3D Single Bubble Breakup Tracking in a Stirred Tank

Three‐Dimensional Observation of Single Air Bubble Breakup in a Stirred Tank

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