Development characteristics of drag-reducing surfactant solution flow in a duct

Suzuki, Hiroshi; Fuller, Gerald G.; Nakayama, Tomoe; Usui, Hiromoto

doi:10.1007/s00397-003-0335-6

Cited by 31 publications

(21 citation statements)

References 19 publications

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“…It has been shown that the hydrodynamic boundary layer thickness for drag reducing surfactant solutions increases for the first approximately 50 hydraulic diameters (the heat exchanger in our experiment was approximately 90 hydraulic diameters long) like a turbulent Newtonian fluid and then follows the equation for laminar Newtonian fluids [22]. It has also been shown that although turbulent intensities in drag reduced flow are dampened compared to water, in the near wall region they can approach or exceed that of water [23].…”

Section: Model Selectionmentioning

confidence: 88%

Heat transfer enhancement in turbulent drag reducing surfactant solutions by agitated heat exchangers

Maxson

Watson

Karandikar

et al. 2017

International Journal of Heat and Mass Transfer

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Drag reducing solutions can reduce turbulent pressure loss by nearly 90% and can decrease pumping energy requirements and increase flow rates in fluid flow systems. Unfortunately, drag reduced flow is accompanied by lower convective heat transfer coefficients, which is undesirable in district heating and cooling systems, heated tube bundles for undersea petroleum production, and other recirculating heat transport systems.In this study, three different rotating agitators were installed inside the inner tube of a concentric tube heat exchanger to enhance heat transfer in a surfactant drag reducing solution. An earlier mathematical model for heat transfer in scraped surface heat exchangers was adapted for this application so that the effectiveness of agitators with different geometries could be compared quantitatively. In addition, an enhancement efficiency factor was defined to compare power efficiency with previous methods. It was found that agitation can increase the inner heat transfer coefficient to exceed that of pure water; heat transfer reduction compared to water was reduced from 60% to -20%. In addition, the enhancement can be more energy-efficient than that of previously studied static mixers.

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Section: Model Selectionmentioning

confidence: 88%

Heat transfer enhancement in turbulent drag reducing surfactant solutions by agitated heat exchangers

Maxson

Watson

Karandikar

et al. 2017

International Journal of Heat and Mass Transfer

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“…In addition, the particles agglomerate and disperse in the slurry, imparting non-Newtonian characteristics to the slurry. [5][6][7][8][9] To increase slurry fluidity, the addition of surfactants that form drag-reducing rod-like micelles [10][11][12][13][14][15] , polymers 3,16) , and some types of brines 1,9,17,18) have been tested to prevent particle agglomeration. These additives also enhance the non-Newtonian behavior of the slurries.…”

Section: Introductionmentioning

confidence: 99%

Crystal Growth and Viscosity Behaviors of Ammonium Alum Hydrate Solution with PVA in Shear Flow

Toyoda

Hidema

Suzuki

et al. 2014

J. Soc. Rheol., Jpn

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“…Electricity savings in buildings can be obtained by improving efficiency of air conditioning systems, since the systems take a large amount of building electricity; in Indonesia, the figure is around 60%. High electricity consumption of air conditioning system also occurred in USA, Japan, and China [1,2,3].…”

Section: Introductionmentioning

confidence: 99%

Thermal Characteristics Evaluation of Vegetables Oil to be Used as Phase Change Material in Air Conditioning System

Indartono¹,

Suwono²,

Pasek³

et al. 2011

jtm

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In a typical commercial building, air conditioning system consumes around 60% of building's electricity. By looking at that number, it is clear that effort to suppress building energy consumption should be directed to air conditioning system. Recently, phase change substances, such as ice slurry, receive broad attention since the substances has ability to save energy in hydronic cooling system. Previous experiments by author showed that certain phase change material, i.e. trimethylolethane trihydrate, is able to save energy of a chiller. However, in Indonesia, the material is quite expensive. In this research, applicability of some lower-price materials, i.e. mixture of vegetables oil and biodiesel, as phase change material in secondary refrigerant were evaluated. Some thermal characteristics, such as freezing and melting temperatures, and also latent heat of the oils are explained in this paper.

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Development characteristics of drag-reducing surfactant solution flow in a duct

Cited by 31 publications

References 19 publications

Heat transfer enhancement in turbulent drag reducing surfactant solutions by agitated heat exchangers

Heat transfer enhancement in turbulent drag reducing surfactant solutions by agitated heat exchangers

Crystal Growth and Viscosity Behaviors of Ammonium Alum Hydrate Solution with PVA in Shear Flow

Thermal Characteristics Evaluation of Vegetables Oil to be Used as Phase Change Material in Air Conditioning System

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