In contrast in This is because as the shear rate is increased, the uid behind the wake is stretched more and more, therefore requiring a larger distance to relax. Pronunciation of Weissenberg with 1 audio pronunciation, 2 translations and more for Weissenberg. The reason for this breakdown has remained somewhat of a mystery. The Weissenberg number is a dimensionless number used in the study of viscoelastic flows. Weissenberg — may refer to: *Weißenberg, a town in Saxony, Germany *the scene of the Battle of White Mountain *Karl Weissenberg (1893 1976), German physicist and founding rheologist, after whom the Weissenberg effect was named *Alexis Weissenberg (b. Continuing to use this site, you agree with this. The Weissenberg number (Wi) is a dimensionless number used in the study of viscoelastic flows. In fluid dynamics, the Morton number (Mo) is a dimensionless number used together with the Eötvös number to characterize the shape of bubbles or drops moving in a surrounding… … Wikipedia, Keulegan–Carpenter number — The Keulegan–Carpenter number is important for the computation of the wave forces on offshore platforms. Another dimensionless number sometimes used in the study of viscoelastic flow is the Weissenbergnumber. It can be variously defined, but it is usually given by the relation of stress relaxation time of the fluid and a specific process time. This was 100% of all the recorded Weissenberg's in the USA. Similar surnames: Eisenberg, Wesenberg, Weisberg, Weisenberger, Seidenberg, Weisenborn The ratio t r /t f is a dimensionless number of particular significance in the study of flow of non-Newtonian fluids: depending on the circumstances, this number is called the Weissenberg Number or the Deborah Number. The dimensionless number is the ratio of the relaxation time of the fluid and a specific process time. (New) In the flow of viscoelastic liquids, the dimensionless Weissenberg number represents the ratio of the viscoelastic force to the viscous force and has sometimes been equated to N 1 /2τ, where N 1 = the first normal stress in a viscoelastic fluid flowing in … While Wi similar to the Deborah number, and is often confused with it in technical literature, they have different physical interpretations. It is named after Karl Weissenberg. He invented a Goniometer to study X ray diffraction of crystals … Wikipedia, Nusselt number — In heat transfer at a boundary (surface) within a fluid, the Nusselt number is the ratio of convective to conductive heat transfer across (normal to) the boundary. It is High Weissenberg Number Problem. Due to the sensitivity of rheology of the condensed phase to structure, rheology is considered as the most convenient method to characterize … It can be variously defined, but it is usually given by the relation of stress relaxation time of the fluid and a specific process time. Rheology is generally lacking in dimensionless numbers except for two - the Deborah Number and the Weissenberg number. It is named after Karl Weissenberg.The dimensionless number is the ratio of the relaxation time of the fluid and a specific process time. High Weissenberg Number Problem - How is High Weissenberg Number Problem abbreviated? If a rheological experiment is faster than the relaxation process, the material will appear elastic (high De number), otherwise the viscous part will dominate (low De number). The dimensionless number compares the viscous forces to the elastic forces. Want to thank TFD for its existence? The Weissenberg number (Wi) is a dimensionless number used in the study of viscoelastic flows. OK. For steady simple shear, the Weissenberg number is the product of the shear rate and a characteristic time of the fluid. For instance, in simple steady shear, the Weissenberg number, often abbreviated as Wi or We, is defined as the shear rate times the relaxation time. Therefore the exact definition of all non dimensional numbers should be given as well as the number itself. The dimensionless number compares the elastic forces to the viscous forces. The Weissenberg number is a dimensionless number used in the study of viscoelastic flows. The most Weissenberg families were found in the USA in 1920. Not affiliated Weissenberg number The Weissenberg number is a dimensionless number used in the study of viscoelastic flows. The conductive… … Wikipedia, Rayleigh number — In fluid mechanics, the Rayleigh number for a fluid is a dimensionless number associated with buoyancy driven flow (also known as free convection or natural convection). Definition… … Wikipedia, Deborah number — The Deborah number is a dimensionless number, often used in rheology to characterize the fluidity of materials under specific flow conditions. The Weissenberg number indicates the degree of anisotropy or orientation generated by the deformation, and is appropriate to describe flows with a constant stretch history, such as simple shear. HWNP - High Weissenberg Number Problem. The dimensionless number compares the elastic forces to the viscous forces. The transformation process reacts to small changes in the material i.e. It is named after Karl Weissenberg. Looking for abbreviations of HWNP? German: habitational name from any of numerous places named Weissenberg. (Some writers, because of the prior use of We for the Weber number (ratio of surface tension forces to inertia) prefer to use Wi as the symbol.) It was originally proposed by Markus Reiner, a professor at Technion in Israel, inspired by a verse in… … Wikipedia, We are using cookies for the best presentation of our site. It can be variously defined, but it is usually given by the relation of stress relaxation time of the fluid and a specific process time. 185.232.66.180, © Springer Science+Business Media, LLC 2011, https://doi.org/10.1007/978-1-4419-6247-8, Reference Module Physical and Materials Science. In gure 3, the force required to move the sphere at a constant velocity through the uid is plotted against Weissenberg number (which for this case may be thought of as On the emergence of Weissenberg effect, the gel was stirred manually for one and a half hours. The general Weissenberg number can also be used to characterize the elastic effects of non-Newtonian fluids in laminar flow. the rheology of the polymer melt is sensitive to small changes in the polymer structure. The first is called the Weissenberg number We. High Weissenberg Number Problem listed as HWNP. Suggest new definition. It gives an estimate of the effects of magnetic advection to magnetic diffusion, and is typically defined by: where U is a typical velocity scale of the… … Wikipedia, Morton number — For Morton number in number theory, see Morton number (number theory). It is defined as: Where μ is the liquid viscosity ρ is the liquid density σ is the surface tension L is the characteristic … Wikipedia, Dean number — The Dean number is a dimensionless group in fluid mechanics, which occurs in the study of flow in curved pipes and channels. The dimensionless number compares the viscous forces to the elastic forces. The Weissenberg number was originally defined as the ratio of normal stress difference to shear stress 36, 56. Wikipedia, Author provided. “ ustratingly low value” of the Weissenberg number (usually around We=1; precise critical value varies with the flow geometry). Source: Dictionary of American Family Names ©2013, Oxford University Press. number, the Deborah number De (or Weissenberg number) and is defined as the ratio of material to process time. For instance, in simple steady shear, the Weissenberg number, often abbreviated as Wi or We, is defined as the shear rate times the relaxation time The Weissenberg family name was found in the USA, and the UK between 1880 and 1920. It can be variously defined, but it is usually given by the relation of stress relaxation time of the fluid and a specific process time. The dimensionless number is the ratio of the relaxation time of the fluid and a specific process time. It is named after Karl Weissenberg. The Weissenberg number indicates the degree of anisotropy or orientation generated by the deformation, and is appropriate to describe flows with a constant stretch history, such as simple shear. The Weissenberg number (Wi) is a dimensionless number used in the study of viscoelastic flows. Jewish (Ashkenazic): variant of Weissberg. The Weissenberg number indicates the degree of anisotropy or orientation generated by the deformation, and is appropriate to describe flows with a … 2 number, Re=ρV η 0 and the Weissenberg number Wi =λV respectively. It is defined as the ratio of viscous forces to elastic forces of a material which is equal to the relaxation time times the shear (New) In the flow of viscoelastic liquids, the dimensionless Weissenberg number represents the ratio of the viscoelastic force to the viscous force and has sometimes been equated to N1/2τ, where N1 = the first normal stress in a viscoelastic fluid flowing in simple shear and τ = the shear stress. I must confess that I never really understood there to be much difference between the two, but a new article in the Rheology Bulletin (pdf file, open access, article starts on p. 14) makes clear the difference. The Weissenberg number Ws is named after Karl Weissenberg, an early worker in the field of non-Newtonian fluids. Named after Wilhelm Nusselt, it is a dimensionless number. Deborah number, De, increases. This service is more advanced with JavaScript available. It is named after Karl Weissenberg. Part of Springer Nature. Wisconsin had the highest population of Weissenberg families in 1880. Jump to: General, Art, Business, Computing, Medicine, Miscellaneous, Religion, Science, Slang, Sports, Tech, Phrases We found one dictionary with English definitions that includes the word weissenberg number: Click on the first link on a line below to go directly to a page where "weissenberg number" is defined. 1.4.1 Weissenberg Rod Climbing Effect When a liquid is stirred using a cylindrical rod, the liquid that wets the rod begins to “climb” up the rod and the interface with the surrounding a ir assumes a steady shape dangling to the rod, so long as there is a continuous rotation. It is named after the British scientist W. R. Dean, who studied such flows in the 1920s (Dean, 1927, 1928). The Weissenberg effect was named after him, as was the Weissenberg number. The dimensionless number is the ratio of the relaxation time of the fluid and a specific process time. 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