Flory's Viscosity Factor for the System Polystyrene + Cyclohexane at 34.5 °C

1980 ◽  
Vol 13 (3) ◽  
pp. 588-592 ◽  
Author(s):  
Y. Miyaki ◽  
Y. Einaga ◽  
H. Fujita ◽  
M. Fukuda
Keyword(s):  
Viscosity Factor

scholarly journals Critical Mach Numbers of Flow around Two-Dimensional and Axisymmetric Bodies

Aerodynamics ◽  
2021 ◽  
Author(s):  
Vladimir Frolov
Keyword(s):  
Mach Number ◽  
Cross Section ◽  
Flow Simulation ◽  
The Body ◽  
Two Dimensional ◽  
Critical Mach Number ◽  
Method Of Integral Relations ◽  
Viscosity Factor ◽  
Mach Numbers ◽  
Axisymmetric Bodies

The paper presents the calculated results obtained by the author for critical Mach numbers of the flow around two-dimensional and axisymmetric bodies. Although the previously proposed method was applied by the author for two media, air and water, this chapter is devoted only to air. The main goal of the work is to show the high accuracy of the method. For this purpose, the work presents numerous comparisons with the data of other authors. This method showed acceptable accuracy in comparison with the Dorodnitsyn method of integral relations and other methods. In the method under consideration, the parameters of the compressible flow are calculated from the parameters of the flow of an incompressible fluid up to the Mach number of the incoming flow equal to the critical Mach number. This method does not depend on the means determination parameters of the incompressible flow. The calculation in software Flow Simulation was shown that the viscosity factor does not affect the value critical Mach number. It was found that with an increase in the relative thickness of the body, the value of the critical Mach number decreases. It was also found that the value of the critical Mach number for the two-dimensional case is always less than for the axisymmetric case for bodies with the same cross-section.

scholarly journals Temperature and the Viscosity of Protoplasm

1924 ◽  
Vol 13 (2) ◽  
pp. 331-339 ◽  
Author(s):  
C. F. A. Pantin
Keyword(s):  
Chemical Process ◽  
Plant Cells ◽  
Effect Of Temperature ◽  
Biological Processes ◽  
Nereis Diversicolor ◽  
Centrifuge Method ◽  
Temperature Coefficients ◽  
Protoplasmic Viscosity ◽  
Viscosity Factor ◽  
Viscosity Changes

(1) The effect of temperature on the viscosity of the protoplasm has been determined in the unripe eggs of Nereis diversicolor by the centrifuge method.The viscosity rises as the temperature falls, the rise becoming rapid near 0°C.(2) These changes of viscosity with temperature are similar to those described by Weber (21) in the protoplasm of certain plant cells.(3) Attention is drawn to the fact that the temperature coefficients of biological processes should be corrected for the viscosity of the protoplasm in which they occur.(4) It is shown that the relative changes of protoplasmic viscosity with temperature are probably of the order required to make the temperature coefficients of biological processes constant when corrected for the viscosity factor.(5) The magnitude of the temperature coefficients of biological processes when corrected for viscosity changes is probably of the same order as that of the temperature coefficients of a chemical process when corrected for changes in the viscosity of its medium.

Determination of the viscosity factor of D16 aluminum alloy in penetration of a cone

1984 ◽  
Vol 16 (10) ◽  
pp. 1484-1489 ◽  
Author(s):  
G. V. Stepanov ◽  
A. P. Vashchenko
Keyword(s):  
Aluminum Alloy ◽  
Viscosity Factor

Coupled Parallel Flows in a Channel and a Bounding Porous Medium of Finite Thickness

1985 ◽  
Vol 107 (3) ◽  
pp. 322-329 ◽  
Author(s):  
N. Rudraiah
Keyword(s):  
Porous Medium ◽  
Porous Layer ◽  
Finite Thickness ◽  
Slip Condition ◽  
Parallel Flows ◽  
Increase With Increase ◽  
Viscosity Factor ◽  
Static Fluid ◽  
Bounded Below ◽  
Plate Channel

The steady laminar flow in a parallel plate channel bounded below by a porous layer of finite thickness and above by a rigid impermeable plate moving with a uniform velocity is studied. The two cases, viz., the porous medium bounded below (i) by a static fluid and (ii) by a rigid impermeable stationary wall, are considered separately. The modified slip condition involving the thickness of the porous layer is derived using the variation of velocity in the porous medium with the proper matching conditions based on the physical considerations. It is shown that when the thickness of the porous layer tends to infinity our modified slip condition tends to the slip condition postulated by Beavers and Joseph [13]. Methods to estimate the viscosity factor λ and relative permeability are discussed. The velocity profiles in the porous layer are shown to exhibit the boundary-layer type very near the porous surface; they increase with increase in depth of the porous medium and decrease with increases in λ. We find that the effect of the finite thickness of the porous medium is significant only for large values of λ and small values of the porous parameter σ.

An Investigation of Confined Vortex Flow Phenomena

1972 ◽  
Vol 94 (3) ◽  
pp. 689-696 ◽  
Author(s):  
Clyde C. K. Kwok ◽  
Ngo Dinh Thinh ◽  
Sui Lin
Keyword(s):  
Apparent Viscosity ◽  
Tangential Velocity ◽  
Vortex Chamber ◽  
Experimental Investigations ◽  
Fluid Viscosity ◽  
Analytical Technique ◽  
Runge Kutta Method ◽  
Analytical Results ◽  
Flow Phenomena ◽  
Viscosity Factor

The swirling, incompressible flow within a short vortex chamber of aspect ratio 1/9, defined by the ratio of chamber height to chamber diameter, has been investigated analytically. The theoretical analysis consists of the adaptation of Wormley’s analytical technique and the extension of the method to include the apparent viscosity factor. The Runge-Kutta method is used to solve numerically the set of differential equations. The analytical results are compared with those of the experimental investigations conducted by Savino and Keshock. The analytical results prove that the values of apparent viscosity seriously affect the velocity profiles within the vortex chamber. The results also show that the apparent viscosity varies from 7000μ at the vortex chamber periphery to 4500μ at the orifice exit plane, where μ is the operating fluid viscosity. An empirical expression for the apparent viscosity is found in the form μa = K1νδn + K2, where n, K1, and K2 are constants and νδ is the tangential velocity. The constants n, K1, and K2 are found to be −1/3, 0.01, and 0.0005, respectively, for this investigation.

Quantum Electrodynamics Calculation of Long - Range Interaction of Biopolymers in Intracellular Dispersion Medium

1997 ◽  
Vol 489 ◽  
Author(s):  
A. O. Pinchuk ◽  
V. I. Vysotskii
Keyword(s):  
Long Range ◽  
Quantum Electrodynamics ◽  
Dispersion Medium ◽  
Room Temperature ◽  
Pure Water ◽  
Range Interaction ◽  
X Ray ◽  
Long Range Interaction ◽  
Viscosity Factor ◽  
Intracellular Medium

AbstractThe general Lifshitz theory of van der Waals interaction was used to formulate and compute energies between the nucleotides situated on the opposite ends of a broken DNA helix. Our calculation show that infrared and ultraviolet resonances in the dielectric functions of DNA and the intracellular liquid account for less then 10 percent of the forces of interaction, at a range of 5-15 angstroms, between nucleotides. Thus the fundamental contribution to the interaction is presented by the group of resonances with frequencies of X - ray range. It was shown that during the interaction between thymine - guanine, adenine - guanine and cytosine - guanine there exists a potential barrier which prevents DNA selfrepairing after a mutanous, over a distance of about 7 - 20 angstroms, at the room temperature and with reference to the viscosity factor for pure water. All the remaining pairs of nucleotides have no such barrier. In addition the barrier vanishes and DNA undergoes complete selfrepairing with the decreace in viscosity of intracellular medium.

Study on Shear Rheological Behavior of Konjac Glucomannan

2011 ◽  
Vol 52-54 ◽  
pp. 1332-1335 ◽  
Author(s):  
Chao Wang ◽  
Mei Xu ◽  
Yu Peng Zhu ◽  
Yu Qiao ◽  
Ting Ting Liang
Keyword(s):  
Rheological Behavior ◽  
Food Industry ◽  
Polynomial Equation ◽  
Konjac Glucomannan ◽  
Flow Index ◽  
Pseudoplastic Fluid ◽  
Linear Change ◽  
Shear Rates ◽  
Non Linear ◽  
Viscosity Factor

Konjac glucomannan (KGM) belongs to pseudoplastic fluid. Remarkable non-linear change tendencies of shear rheological behavior of KGM were detected through analysis of the correlation of viscosity (η)-shear rates and shear stress-shear rates respectively, and its shear rheological curves conformed to the Power Law (τ=ＫDn). The change tendencies of viscosity factor (K) and flow index (n) correlated with concentration and temperature were also obtained, the curves can be fitted by power and quadratic polynomial equation respectively. The acquired non-linear correlation curves of K and n can provide reliable foundation for rational applications of KGM in food industry and its grade estimation.

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