2 edition of apparent viscosity of fluidized solids by the falling ball method found in the catalog.
apparent viscosity of fluidized solids by the falling ball method
Lloyd Mathew Guenther
Written in English
|Statement||by Lloyd Mathew Guenther.|
|The Physical Object|
|Pagination||37 leaves, bound :|
|Number of Pages||37|
Fluidization: UnitOperations 1 1 Introduction Fluidized beds are used widely in chemical processing industries for separations, rapid mass and heat transfer operations, and catalyic reactions. A typical ﬂuidized bed is a cylindrical column that contains particles and through which ﬂuid, either gaseous or File Size: 2MB. Viscosity 5 Viscosity coefficients Viscosity coefficients can be defined in two ways: • Dynamic viscosity, also absolute viscosity, the more usual one (typical units Pas, Poise, P); • Kinematic viscosity is the dynamic viscosity divided by the density (typical units m2/s, Stokes, St). Viscosity is a tensorial quantity that can be decomposed in different ways into two independent Size: 2MB.
Viscosity Measurement Shear Viscosity Viscometers • Falling Body Methods • Oscillating Method • Ultrasonic Methods Shear Viscosity An important mechanical property of ﬂuids is viscosity. Physical systems and applications as diverse as apparent viscosity called the plastic viscosity, and the exponent nFile Size: KB. Measuring Liquid Viscosity-Falling Sphere Method Viscosity of Newtonian Fluids using Haake Falling Ball Physics - Fluid Dynamics (11 of 25) Viscosity & Fluid Flow: Object Falling .
An indirect method is the quasi-solid emulsion viscosity method developed by Kono et al. (), where the viscosity is measured indirectly through the measurement of fluidization parameters. Whether a fluidized bed has to be considered a Newtonian or a Cited by: A falling ball viscometer is described requiring a sample volume less than 1 ml. Photoelectric read out allows for a fast and simple measurement procedure. The accuracy of the instrument is +or
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The apparent viscosity of fluidized solids by the falling ball methodAuthor: Lloyd Mathew Guenther. Appendix A Standards Pertaining to Viscosity ISO Plastics—Determination of viscosity using a falling ball viscometer ISO Rubber latex—Determination of apparent viscosity by Brookﬁeld test method ISO Paints and varnishes—Determination of ﬂow time by use of ﬂow cupsFile Size: KB.
Apparent Viscosity of Gas-Solid Fluidized by: 5. The falling ball viscometer typically measures the viscosity of Newtonian liquids and gases. The method applies Newton’s law of motion under force balance on a falling sphere ball when it reaches a terminal velocity.
The apparent viscosity of a fluidized bed has been measured with paddles, rotating spheres, a falling ball or Couette-type viscometers. These results have wide variations that are partly due to the difficulties in estimating the viscosity of a fluidized system where the peripheral velocities of submerged objects are equal in magnitude to particle velocities in the undisturbed bed .Cited by: Laboratory experiments and numerical simulations are performed to determine the accuracy and reproducibility of the falling-ball test for viscosity determination in Newtonian fluids.
The results explore the wall and end effects of the containing cylinder and other possible sources that affect the accuracy and reproducibility of the falling ball Cited by: Due to the increase in the particle volume fraction arising from the presence of solid particles, interaction forces such as collision and cohesion, and external friction between the solid particles, become the main effects leading to the increase in the the apparent viscosity of dense gas-solid flow, such as that in a fluidized bed, can be measured by different methods such as a paddle-type viscometer, a falling Cited by: 3.
Viscosity can be measured by the falling sphere method using the X-ray radiography (e.g. Suzuki et al., ).In the viscosity measurement, the Stokes' equation with the Faxen correction (Faxen, ) is applied to correct the wall effect for the terminal velocity. The system was used to determine the apparent viscosity of a fine powder fluidized homogeneously by ambient nitrogen over a range of expansion conditions.
The results revealed pseudo-plastic-type behavior, the measured apparent viscosities decreasing markedly with increasing shear stress. Previous article.
in by: These methods can only measure the viscosity by direct contact with the fluid, and it is impossible to test the viscosity of the fluid in the porous media: that is, the in situ viscosity of fluid. Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link).
Literature concerned with measuring the apparent viscosity of the particulate phase, μfluid(mf), of a bubbling, gas-fluidized bed is reviewed. It is demonstrated that values of μfluid(mf) derived. The pseudo-fluid analogy for a fluidized bed Implicit in the notion of an apparent viscosity for a fluidized suspension is that of a pseudo-fluid, visualized as a continuum, whose properties depend on those of its component parts: the fluid itself, together with those of the suspended by: 1 Studies On Falling Ball Viscometry Amit Vikram Singh1, Lavanjay Sharma2, and Pinaki Gupta-Bhaya1 Departments of Chemistry1, Material Science Programme2, Indian Institute of Technology Kanpur, Kanpur India Abstract: A new method of accurate calculation of the coefficient of viscosity of a test liquid from experimentally measured terminal velocity of a ball falling in the test liquid Cited by: 1.
of liquids, called the falling ball method, is based on the fall of an object through a liquid. The experiment is realized using a setup called the falling ball viscometer, which typically measures the viscosity of Newtonian liquids .
For the validity of this method, the user must allow the falling object, usually a spherical ball, to reachCited by: 5. Although many researchers have investigated the rheology of gas-fluidized powders no reliable theoretical description is as yet available.
Various measuring methods have been applied, varying from Stormer, Brookfield or Couette viscometers, torsion pendulum or floating/falling ball-methods to the study of average flow velocity through open inclined or horizontal by: 2.
The Apparent Viscosity of the Particulate Phase of Bubbling Gas-Fluidized Beds: A Comparison of the. Use a falling-ball method to determine the viscosity of a liquid Practical activities have been safety checked but not trialled by CLEAPSS. Users may need to adapt the risk assessment information to local circumstances.
Core practical 4: Use a falling-ball method to determine the viscosity of a liquid Objective Safety To time the fall of a ball File Size: KB.
In this article, I will extend the falling ball method to measure the viscosity of liquids regardless of the degree of their viscosity. For this, I will show that one can obtain a measurement of the terminal velocity of a falling spherical ball in a viscous liquid by solving numerically the equation of motion which describes the dynamics of the ball from the beginning to the end of the by: 5.
A falling ball viscometer consists of a cylinder filled with the fluid in question into which a ball of known density and dimensions is dropped. The velocity was calculated from the time it took a falling ball to pass a set distance between two markers on the graduated cylinder.
The ball is assumed to reach terminal velocity over the timed File Size: KB. McDougall et al.  examined different methods to evaluate the fluidization quality, such as a falling ball to measure the bed viscosity, a funnel to measure the gravity flow time of a bed sample.
A standard viscometer for very viscous fluids is the falling ball viscometer. Yes, it applies when the Reynolds number is very low. Typically, the viscosity of the fluid will be on the order of 's to 's of poise, and the ball will only be on the order of a few mm.Rynning9, Scott10, and others on determining a viscosity of fluiclized solids by measuring the pressure drop through a tube and by the uso of a rotating cylinder viscometor.
The purpose of this paper is to supplement these data with viscosities of several fluidized solids obtained with a falling ball viscometer. The materials studied in this.