Eotvos

The surface tension of most liquids decreases with increasing temperature in a nearly linear fashion, eis illustrated in Fig. III-2. The near-linearity has stimulated many suggestions as to algebraic forms that give exact linearity. An old and well-known relationship, attributed to Eotvos [3], is... 

We also received a solid edncation in mathematics, as well as some physics and chemistry. Although, among others, the physicist Lorand Eotvos and the chemist George Flevesy (Nobel Prize in 1943) attended the same Piarist school in earlier years, I learned about this only years later and cannot remember that anybody mentioned them as role-models during my school years. Classes were from 8 AM to 1 PM six days a week, with extensive homework for the rest of the day. I did... 

Atomization = Eotvos numher, Eo Two-phase flows, free surface flows Compressible flow, hydraulic transients Cavitation... 

Eo = Eotvos number = gA dVc Re = Reynolds number = du /[L Ap = density difference between the phases p = density of continuous liquid phase d = drop diameter [L = continuous liquid viscosity surface tension u = relative velocity... 

CAM-PC is a general purpose CA software simulation environment based on CAM-6, Designed by members of the GENOME Project at Eotvos University in Hungary, the first version of CAM-PC extends the possibilities of CAM-6 but is not yet fully compatible with it. The primary addition is support for 8 bit planes, increasing the size of CAM-6 s ccdl-statc alphabet to 256, The laudable purpose behind the project is to provide inexpensive but otherwise fully functional simulation tools for amateur researchers unable to afford faster dedicatcxl hardware. 

A very remarkable theorem respecting the constant B was found empirically by Eotvos (6) (1886). Let a mol of a liquid... 

Structural Chemistry Research Group of the Hungarian Academy of Sciences, Eotvos University, PO Box 117, Budapest, H-1431, Hungary... 

In order to take into account the effect of surface tension and micro-channel hydraulic diameter, we have applied the Eotvos number Eo = g(pL — pG)d /(y. Eig-ure 6.40 shows the dependence of the Nu/Eo on the boiling number Bo, where Nu = hd /k] is the Nusselt number, h is the heat transfer coefficient, and k] is the thermal conductivity of fluid. All fluid properties are taken at the saturation temperature. This dependence can be approximated, with a standard deviation of 18%, by the relation ... 

The large heated wall temperature fluctuations are associated with the critical heat flux (CHE). The CHE phenomenon is different from that observed in a single channel of conventional size. A key difference between micro-channel heat sink and a single conventional channel is the amplification of the parallel channel instability prior to CHE. As the heat flux approached CHE, the parallel channel instability, which was moderate over a wide range of heat fluxes, became quite intense and should be associated with a maximum temperature fluctuation of the heated surface. The dimensionless experimental values of the heat transfer coefficient may be correlated using the Eotvos number and boiling number. 

David Cole-Hamilton, University of St Andrews, Scotland Istvan Horvath, Eotvos Lorand University, Hungary Kyoko Nozaki, University of Tokyo, Japan Robert Waymouth, Stanford University, U.S.A. 

We have so far succeeded in establishing connections between surface tension and a number of physical properties, but have not yet found a relation between the former and any chemical constant. A very simple and general relation of this kind was first pointed out by the Hungarian physicist Eotvos and confirmed experimentally, for a large number of liquids, by Ramsay and Shields. If M is the molecular weight of a liquid and p its density, then... 

The Eotvos-Ramsay-Shields formula represents the most important relation between surface tension and molecular weight so far established. A number of other and very interesting connections have, however, been pointed out by Walden in a series of papers... 

Van der Waals further finds a relation between the temperature coefficient of surface tension and the molecular surface energy which is in substantial agreement with the Eotvos-Ramsay-Shields formula (see Chapter V.). He also arrives at a value for the thickness of the transition layer which is of the order of magnitude of the molecular radius, as deduced from the kinetic theory, and accounts qualitatively for the optical effects described on p. 33. Finally, it should be mentioned that Van der Waals theory leads directly to the conclusion that the existence of a transition layer at the boundary of two media reduces the surface tension, i.e., makes it smaller than it would be if the transition were abrupt—a result obtained independently by Lord Rayleigh. 

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