Last edited by Gardara
Tuesday, July 14, 2020 | History

2 edition of Influence of drag reducing additives upon torque and mixing in stirred vessels. found in the catalog.

Influence of drag reducing additives upon torque and mixing in stirred vessels.

Abdul Qudeer Quraishi

Influence of drag reducing additives upon torque and mixing in stirred vessels.

by Abdul Qudeer Quraishi

  • 123 Want to read
  • 18 Currently reading

Published by University ofSalford in Salford .
Written in English


Edition Notes

PhD thesis, Chemical Engineering.

SeriesD18432/77
ID Numbers
Open LibraryOL19687592M

dimensional, drag-reducing channel flows to determine the effect of wall strain rate, polymer concentration and channel height upon drag reduction and turbulent structure. Water flows at equal wall shear stress and with Reynolds numbers f to 34, were measured for comparison. To give an overview of drag reduction and corresponding heat transfer for further understanding, this paper summarizes the main advancements of drag reduction during these 60 years, including background, application, development, theory, and research methods of different drag reducers. Future directions of development are also discussed.

The drag torque estimated by the model is the sum of drag torque due to shearing of the automatic transmission fluid (ATF) and mist (suspension of ATF in air) film. In order to validate the model and characterize the drag torque, experiments are performed using an SAE no. 2 test setup under real conditions of variable ATF flow rate and disks. A system for reducing pressure drop associated with the turbulent flow of asphaltenic crude oil through a conduit. The crude oil has a high asphaltene content and/or a low API gravity. Such reduction in pressure drop is achieved by treating the asphaltenic crude oil with a high molecular weight drag reducing polymer that can have a solubility parameter within about 20 percent of the solubility.

Drag Reducing Agents and Additives. If HEP Operating determines that adding drag reducing agents (“DRA”) to the Products is reasonably required to move the Products in the quantities necessary to meet HFRM’s schedule or as may be otherwise be required to safely move such quantities of Products or that additives should be used in the operation of the Applicable Assets, HEP Operating shall. TADPRO, the most comprehensive torque and drag software in the market, removes many of the risks of a drilling program, completion design or specific tool operation. Limits in the length of a horizontal based on specific friction factors can be determined.


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Influence of drag reducing additives upon torque and mixing in stirred vessels by Abdul Qudeer Quraishi Download PDF EPUB FB2

The influence of the addition of a drag reducing agent ( ppm PAA) to a pure liquid (water) in a stirred vessel has been studied. The vessel was stirred with two types of agitators, a Rushton turbine and an axial A by: 8. Influence of Drag Reducing Additives upon Torque and Mixing in Stirred Vessels.

Author: Quraishi, A. ISNI: Awarding Body: University of Salford Current Institution: University of Salford Date of Award: Availability of Full Text. Hibberd M., Kwade M., Scharf R. () Influence of drag reducing additives on the structure of turbulence in a mixing layer.

In: Giesekus H., Kirschke K., Schurz J. Cited by:   Relative torque suppression in aerated tanks stirred by a turbine (D = 10 cm) Volumetric gas rate (1/min) 0 Drag reducing p.p.m.

PAA AD o V additive: p.p.m. PEO A a a V p.p.m. fibres ^ t 4> ^ p.p.m. fibres in p.p.m. PAA A ^ p.p.m. fibres in p.p.m. PEO ^ t Cited by: Xueyu Qi, Ting Wu, Yiming Chen, Ke Yang, Luyao Zhang, Wei Zhao, Jing Gong, Investigation on Flow Field Characteristics by Drag Reducing Agent Additives in a Stirred Vessel, Journal of Energy Resources Technology, /,10, ().Cited by: Berman, N.S.

A qualitative understanding of drag reduction by polymers. In The Influence of Polymer Additives on Velocity and Temperature Fields (IUTAM Symp. ), ed.

Gampert, B., Springer-Verlag, pp. – Google Scholar. Unlike the tubular flow, the influence of the fibrous additive is stronger than that of the polymer but their combined action seems to be additive. The action of the drag-reducing additives is.

A composition is disclosed including 10 to 30 wt-% alpha olefin polymer, 50 to 80 wt-% vegetable oil, to 10 wt-% stabilizing agent(s), and 1 to 10 wt- % pour point modifier, wherein the percentages are calculated on the combined weight of constituents of the composition.

This study reveals that the mixing-length theorem is valid to express the drag-reducing phenomenon and that the presence of polymer additives increases the damping factor B in van Driest’s model; subsequently reducing the mixing-length, this interprets that the polymer hampers the transfer of turbulent momentum flux, the velocity is increased.

the influence of drag reducing additives on the power consumption characteristics of standard turbines and paddles is investigated te amount of torque suppression was in.

Description. Drag reducing agents can be broadly classified under the following four categories – Polymers, Solid-particle suspensions, Biological additives, and agents are made out of high molecular weight polymers or micellar systems. The polymers help with drag reduction by decreasing turbulence in the oil lines.

This allows for oil to be pumped through at lower. THE INFLUENCE OF DRAG REDUCING POLYMER ADDITIVES ON SURFACE PRESSURE FLUCTUATIONS ON ROUGH SURFACES I. INTRODUCTION S'1.l:t'faoe press'1.l:t'e fluotuations on S'1.l:t'faces in relative motion with a fluid have been the subject of considerable investigation with regard., to vibration an5i noise of airoraft.

The influence of drag-reducing additives on crude oil emulsions in pipeline flow period of approximately 30 s for PA and PA-C1. We also notice a dramatic fall of the pressure drop for PA-C2 and PA-C3 samples.

There were observed no influences of the additives on the measured pressure differences for PB samples. 0 5 Drag reduction is the increase in pumpability of a fluid caused by the small amount of additives.

Practically, adding a small concentration of the drag reducing polymers (DRPs) to the carrier fluid reduces the friction of the fluid and increases the capacity of pipeline without changing the pipelines flow conditions [].This phenomenon of the DRPs has been applied in the transportation of crude.

The JASON Summer Study on Drag Reduction focused on the physics which underlies methods utilizing polymer additives. The study in-cluded a review of drag reduction phenomenology, the development of con-tinuum models of the dynamics of dilute polymer solutions, the introduction.

The three factors are used to reduce the profile loss, friction loss, and impacting loss, respectively. Each factor has been proved that it possesses positive effect on drag reduction. However, considering published literatures, those factors or their combination is rarely applied in torque converter to obtain drag reduction.

Drag Reduction of Complex Mixtures discusses the concept of drag reduction phenomena in complex mixtures in internal and external flows that are shown experimentally by dividing flow patterns into three book is intended to support further experiments or analysis in drag reduction.

As accurately modeling flow behavior with drag reduction is always complex, and since drag reducing. NuFlo™ Drag Reducers are a cost-effective way to reduce friction and turbulence in a pipeline, thereby allowing the crude oil to flow more efficiently.

This non-hazardous flow improver maximizes pumping efficiency and increases throughput and flow rate in the pipeline. NuFlo™ Drag Reducers are applied at a dosage of ppm. Drag-reducing agents, or drag-reducing polymers, are additives in pipelines that reduce turbulence in a pipe.

Usually used in petroleum pipelines, they increase the pipeline capacity by reducing. The Influence of Drag Reducing Polymer Additives on Surface Pressure Fluctuations on Rough Surfaces.

Killen, John; Almo, John (St. Anthony Falls Hydraulic Laboratory, ) Experimental measurements were made to determine the effect of drag reducing polymer additives on the surface pressure fluctuations on smooth and rough surfaces in.

The addition of elastic effects, on the other hand, has an adverse effect on the drag reduction, i.e. the viscoelastic polymer model shows less drag reduction than the anisotropic model without elasticity. Moreover, for the case of the viscoelastic model not all turbulence statistics show the right behaviour.drag-reducing polymers will reduce the rate of mass transfer in jet reactors through the increase of the diffusion layer thickness.

The degree to which the rate of mass transfer in jet reactors is decreased by drag-reducing polymer will be examined in the present work.

This can help in judging the economic feasibility of using drag-reducing.Drag Reduction of Turbulent Flows by Additives is the first treatment of the subject in book form. The treatment is extremely broad, ranging from physicochemical to hydromechanical aspects.

The book shows how fibres, polymer molecules or surfactants at very dilute concentrations can reduce the drag of turbulent flow, leading to energy savings.