Flow past a porous plate of non-Newtonian fluids with implicit shear stress shear rate relationships

Electrorheological fluids (ERFs) can change their shear stress and shear rate as a function of the electric field intensity thus, such fluids acts as Newtonian fluids, if no electric field is applied and, become non Newtonian fluids if the presence of an electric field. In the last years, a growth interest is manifested for incorporating smart fluids into structures, as clutches or dumpers. The ERFs shear rate and shear stress must be determined at the moment of designing such mechanical structures. The fluids viscosity is studied by aid of commercially available viscosimeters or rheometers, these do not have the possibility to apply an electric field to the studied fluids. The ER fluids must be studied into specific electric field intensity. This paper presents: a low cost experimental rheometer and experimental results obtained form a study of several commercially available ERFs.

Download Full-text

Effect of Octyl Salicylate With Respect To the Physical Appearance of Mono/Di Caprylic and Capric Fatty Acids Formulations

Journal of Pharmaceutical Research ◽

10.33140/jpr/01/01/00003 ◽

2016 ◽

Vol 1 (1) ◽

Keyword(s):

Fatty Acids ◽

Particle Size ◽

Shear Stress ◽

Shear Rate ◽

Flow Behavior ◽

Physical Appearance ◽

Newtonian Fluids ◽

Particle Sizes ◽

Medium Chain ◽

Medium Chain Fatty Acids

Caprylic and capric acids are classified as medium-chain fatty acids. In this study, the behavior of the caprylic and capric acids formulations containing octyl salicylate were investigated. The formulations were prepared using homogenization proses. The characteristics of the formulation such as particle size, flow behavior, microscopic view and absorbance of the formulations were investigated. Particle sizes of the formulations were found ranging from 352.7 - 704.2 nm. The viscosity of the formulations changed as the shear rate was varied and could be classified as non-Newtonian fluids. The viscosity decreases when the fluid undergoes longer shear stress with time. The formulations containing octyl salicylate shows higher absorbance as compared to the formulations without octyl salicylate. The addition of octyl salicylate affected the system in terms of behavior, appearance and stability

Download Full-text

d THE EFFECT OF CONCENTRATIONS OF BENTONITE ON THE PROPERTIES OF NON-NEWTONIAN FLUIDS

THE IRAQI JOURNAL FOR MECHANICAL AND MATERIALS ENGINEERING ◽

10.32852/iqjfmme.v20i1.459 ◽

2020 ◽

Vol 20 (1) ◽

pp. 37-46

Author(s):

Muhanned A.R.Mohammed

Keyword(s):

Shear Stress ◽

Shear Rate ◽

Yield Point ◽

Research Study ◽

Methyl Cellulose ◽

Plastic Viscosity ◽

Newtonian Fluids ◽

Carboxy Methyl Cellulose ◽

Constant Concentration ◽

Carboxy Methyl

This research study the properties of Non-Newtonian fluids. Eight samples of Non-Newtonian fluids were prepared, with constant concentration of Carboxy methyl cellulose (CMC) which was (2 gm/500cc), and different concentrations of weighting material (Bentonite). The concentrations of Bentonite were (8, 10, 12, 20, 26, 32, 36, 42) grams with 500 ml water. It was concluded that the increase in the concentration of Bentonite will increase the shear stress with the increase of shear rate. It was also concluded that the increase in the concentration of Bentonite will increase the plastic viscosity, yield point, and density of these Non-Newtonian fluids.

Download Full-text

Laminar Flow of Non-Newtonian Fluids in Concentric Annuli

Society of Petroleum Engineers Journal ◽

10.2118/615-pa ◽

1963 ◽

Vol 3 (04) ◽

pp. 274-276 ◽

Cited By ~ 7

Author(s):

Robert D. Vaughn

Keyword(s):

Shear Stress ◽

Shear Rate ◽

Laminar Flow ◽

Power Law ◽

Experimental Work ◽

Newtonian Fluids ◽

Horizontal Line ◽

Parallel Plates ◽

Bingham Plastic ◽

Fluid Behavior

The limiting cases of non-Newtonian fluids flowing inside a concentric annular duct are developed without using a model of the fluid behavior. The solutions provide limits with which to test the various models of fluid behavior such as the power law and Bingham plastic models. The results of previous theoretical work are discussed in terms of limiting cases. This limiting case study also shows that experimental work on flow of non-Newtonian fluids in annular ducts should be confined to ducts for which the ratio of the radius of the inner wall to that of the outer wall is less than 0.3 and preferably less than 0.2. Introduction During the last 10 years the problem of laminar flow of non-Newtonian fluids in concentric annuli has received much attention largely because of its application to the hydrodynamics of the wellbore. Recently solutions utilizing the power law and Bingham plastic models have been published.In this paper the method of limiting cases, which has been successfully applied to laminar-flow heat transfer will be applied to the problem of flow of non-time dependent, non-Newtonian fluids through annuli. This method permits solutions for the limiting cases to be made without using a model of unknown validity. The solutions, therefore, provide limits with which to test the various models which have been or will be proposed. A pertinent conclusion concerning the region of experimental work is also provided. DEVELOPMENT OF LIMITING CASES The limiting cases for the axial flow of fluids in concentric annuli may be defined with reference to Fig. L It is possible to define two limiting cases which pertain to the physical dimensions of the annulus. First, the annulus must degenerate to a circular pipe as the radius of the inner wall decreases or, as K = (KR/R) - 0. Second, the annulus must approach the limit of parallel plates of infinite extent as the spacing between the inner and outer tubes becomes small in comparison with the radius R of the annulus, or as K - 1. It is also possible to ascertain three limbing cases which pertain to fluid behavior. With reference to Fig. 2, as a fluid becomes progressively more pseudoplastic, the shear stress- shear rate relationship progressively approaches the indicated horizontal line more closely. At this limit the shear stress becomes independent of the shear rate. At the other extreme of increasingly dilatant behavior, the vertical asymptote is approached. Intermediate between these two limiting cases lies the case of the Newtonian fluid. Fluids which exhibit a yield shear stress also approach the limbing case of "infinite" pseudoplastic behavior. SPEJ P. 274^

Download Full-text

RADIATION ABSORPTION AND VISCOUS-DISSIPATION EFFECTS ON MAGNETOHYDRODYNAMIC FREE-CONVECTIVE FLOW PAST A SEMI-INFINITE, MOVING, VERTICAL, POROUS PLATE

International Journal of Fluid Mechanics Research ◽

10.1615/interjfluidmechres.2018024790 ◽

2018 ◽

Vol 45 (5) ◽

pp. 439-458 ◽

Cited By ~ 1

Author(s):

K. V. B. Rajakumar ◽

K. S. Balamurugan ◽

Ch. V. Ramana Murthy

Keyword(s):

Viscous Dissipation ◽

Convective Flow ◽

Porous Plate ◽

Radiation Absorption ◽

Free Convective Flow ◽

Vertical Porous Plate ◽

Flow Past

Download Full-text

MAGNETOHYDRODYNAMIC FLOW PAST A POROUS PLATE IN PRESENCE OF RAYLEIGH TYPE STREAMING EFFECT

Journal of Porous Media ◽

10.1615/jpormedia.2019026438 ◽

2019 ◽

Vol 22 (9) ◽

pp. 1197-1206

Author(s):

Fathimunnisa ◽

Sirangala Ganesh Rakesh ◽

Neetu Srivastava

Keyword(s):

Porous Plate ◽

Magnetohydrodynamic Flow ◽

Flow Past

Download Full-text

Unsteady MHD Free Convective Heat and Mass Transfer Flow Past a Vertical Porous Plate in the Presence of Radiation and Chemical Reaction

International Journal of Emerging Research in Management and Technology ◽

10.23956/ijermt.v6i10.75 ◽

2017 ◽

Vol 6 (10) ◽

pp. 116

Author(s):

J. Buggaramulu ◽

M. Venkatakrishna ◽

Y. Harikrishna

Keyword(s):

Mass Transfer ◽

Heat And Mass Transfer ◽

Convective Heat ◽

Chemical Reaction ◽

Porous Plate ◽

Physical Parameters ◽

Governing Equations ◽

Vertical Porous Plate ◽

Flow Past ◽

Transfer Flow

The objective of this paper is to analyze an unsteady MHD free convective heat and mass transfer boundary flow past a semi-infinite vertical porous plate immersed in a porous medium with radiation and chemical reaction. The governing equations of the flow field are solved numerical a two term perturbation method. The effects of the various parameters on the velocity, temperature and concentration profiles are presented graphically and values of skin-frication coefficient, Nusselt number and Sherwood number for various values of physical parameters are presented through tables.

Download Full-text