Irakli Shekriladze

• Georgian Technical University

Not very rare in reality, socially very dangerous rapid intensification (RI) of tropical cyclone (TC) during landfall remains actually an unpredictable phenomenon. Attempts to identify the presence of such a critical forecasting problem have so far been unsuccessful. In the work, the problem is again considered within the framework of the alternati...

The paper outlines the role of Georgian background in the hypothetic Georgian-Greek project "Buddha-Iodasaf-Josaphat". Examination of the extraordinary bilingual literary works of Euthymius the Athonite highlights important features of the phenomenon "Barlaam and Josaphat", which was considered as just a "popular book" for a millennium until it was...

A belated surge of interest towards the great Georgian-Greek tandem "Balavariani"-"Barlaam and Josaphat" and the historical figure of the 10-11 centuries Eqvtime Atoneli (Euthymius the Athonite, Euthymius the Hagiorite...) was only partially associated with long delay with attribution of the Barlaam novel. Another obstacle was serious shortcomings...

Far-reaching changes in global energy market, triggered by the so-called “shale revolution” and related worldwide activities push into the forefront the problem of investigation of shale resources of Georgia. At the stage of preliminary analysis, it was suggested to focus on the possible full geological study of promising regions by non-drilling me...

A belated surge of interest towards the great Georgian-Greek tandem “Balavariani” -“Barlaam and Josaphat” and the historical figure of the 10-11 centuries Eqvtime Atoneli (Euthymius the Athonite, Euthymius the Hagiorite…) was only partially associated with long delay with attribution of the Barlaam novel. Another obstacle was serious shortcomings i...

It took a millennial stay as “the most popular book” until “Barlaam and Josaphat” was comprehended as the first step on the long journey to the European Enlightenment and the authorship of the Georgian-Greek writer, scientist, philosopher and theologian Euthymius the Athonite was finally recognized. This fact reunited great Georgian-Greek tandem “B...

This paper discusses thermo-mechanical consequences of the pumping effect of growing bubble (PEGB) resulting in surface thermal stresses during nucleate boiling. Unfortunately, the unavailability of boiling heat transfer studies specifically addressing the scope and duration of the PEGB effect, including lack of models and universal correlations of...

A paper discusses consequences of the neglect of universal features of macro- and microscale boiling uncovered by the basic model “theater of a director”, such as control of developed boiling heat transfer by nucleation at microscale, regardless of the inputs and composition of individual cooling mechanisms, pumping effect of growing bubble, micro-...

Summarizing the first decade of developing equilibrium translation model (ETM) the focus is made on the phenomenon of rapid intensification (RI) of tropical cyclone (TC) during landfall. Among 38 strong TCs fourth and fifth categories, hit land around the globe in 2004 - 2013, 16 strengthened during landfall causeing considerable portion of the tot...

Far-reaching changes in global energy market, triggered by the so-called "shale revolution" and related worldwide activities push into the forefront the problem of investigation of shale resources of Georgia. In the paper a brief survey of shale deposits of Georgia is presented in the context of the prospects of shale gas (SG) mining. The primary t...

The review on boiling heat transfer addresses many critically important problems including the disregard of the pumping effect of growing bubbles (PEGB), the so-called "model of the theatre of director" (MTD), and the universal MTD-based correlation. In this review, with respect to PEGB, MTD, and the MTD-based correlation, emphasis is placed on the...

The review on boiling heat transfer addresses many critically important problems including the disregard of the pumping effect of growing bubbles (PEGB), the so-called “model of the theatre of director” (MTD), and the universal MTD-based correlation. In this review, with respect to PEGB, MTD, and the MTD-based correlation, emphasis is placed on the...

The distributed anticipatory restratification concept (DARC) points the way to prevent severe convective storm. DARC provides artificial discharge instability energy of moist unstable lower atmosphere by convective clouds proactively forced in the area to be protected. The paper discusses some problems associated with the implementation of distribu...

The analysis of some major tropical cyclones (TC) has been performed in the framework of the so-called model of equilibrium translation (MET) in order to eliminate the contradiction between the available field data and thermodynamic theory of maximum potential intensity (MPI). According to the MET, TC is an open dissipative system internally aimed...

A model of the “theatre of director” (MTD) links dependence of developed boiling HTC only on two external parameters (heat flux and average effective radius of active nucleation sites) to short duration of each action of cooling mechanisms. According multifactoring concept (MFC) significant prolongation of the actions of cooling mechanisms leads to...

In the past decade, one of the most resonant failure of prediction service has been associated with unpredicted rapid intensification of tropical hurricane (TH) Charley attacked on high power the southern-western Florida on August, 13, 2004. In the paper the results of analysis Charley's development in the framework of so-called equilibrium transla...

Conceptual design of flat-plate collector (FPC) with integrated solar-powered pump (SPP) has been carried out. SPP represents simple heat engine - membrane pump operating through alternating of processes of evaporation and condensation in its working chamber. It should provide circulation of water using part of absorbed by FPC heat returning it fin...

A keynote paper presents just the next attempt to promote a discussion of modern state of art in the field of boiling heat transfer research. It is shown how unwillingness to deconstruct internal contradictions of applicable approaches has resulted longstanding theoretical deadlock. Alternatively, it also is shown how resolution of these contradict...

A review discusses current status of boiling heat transfer research. Basic experimental facts, physical models and correlations of experimental data on heat transfer coefficient (HTC) are reconsidered. Principal restrictions of traditional model of "the theatre of actors" (MTA) are demonstrated. Basic role of control of HTC by thermodynamic conditi...

A survey is presented of the unsolved problems in forced-convective condensation heat transfer theory taking into account structure-related thermo-hydraulic feedback phenomena (connected with the influence of condensation on structural characteristics of two-phase flow). During the last decades advances in forced-convective condensation heat transf...

In this paper a survey is given of the current state of investigations into the mechanism of heat removal in developed boiling. An attempt is made at a critical analysis of both the methodical aspects of these investigations and certain typical interpretations of experimental results.

The mechanism which underlies the concentration of heat, dissipated over vast areas of the nearearth layer of unstably stratified moist atmosphere, with its further partial transformation into mechanical energy, is considered. This forms the basis of a powerful convective formation of clouds leading to the fall-out of hail. Some possible methods of...

The operating regimes of a heat pipe verging on the state of complete transition of the heat-transfer agent into the vapor phase are studied analytically and experimentally. It is shown that under definite conditions the temperature of the condensation zone in the investigated regimes for all practical purposes no longer depends on the temperature...

Experimental results are presented on the physical and chemical processes affecting the reliability of a chromium-nickel stainless steel heat pipe in the 373-473 K temperature range, with water as the working fluid. It is found that the main cause of heat-pipe failure is electrochemical corrosion, with the release of hydrogen and solid corrosion pr...

The laminar shear flow of a viscous fluid is compared to a medium with a metastable phase state. The realization of the latter's eddy-forming potential is hindered by the absence of 'nuclei' of a new 'eddy phase' in the form of nondeformed regions of flow. With regard to an actual fluid, two levels of superposition of a discrete structure with nond...

We present results of an experimental test of a method for studying critical heat fluxes in boiling water without destroying the electrically heated experimental sections.

In conformity with the heat transfer model considered, the developed boiling temperature conditions of the heating surface are mainly governed by the processes which are responsible for multipe star-ups of the different mechanisms of heat release. The analysis of the model yields a universal correlation for the developed boiling heat transfer on su...

The principal results of a number of experimental and analytic studies, concerned with various thermophysical aspects of boiling are presented. The distribution of the heat flux between the liquid and vapor phases during fluctuations of wall temperature, brought upon by boiling on a single nucleation site, was investigated experimentally. Experimen...

The results of an experimental investigation of heat transfer in the boiling and condensation of nitric oxide, carbon monoxide, and boron trifluoride are given.

(For abstract see issue 14, p. 2341, Accession no. A77-32389)

A method of determining the influence of interphase friction on heat transfer intensity in the course of film condensation of flowing metal vapor is developed on the basis of classical results in the hydrodynamics of suction boundary layers. Correction functions are derived with the aid of which the applicability of a theory based on an asymptotic...

The inertial characteristics of the thermal processes underlying a new method of measuring turbulent pressure and velocity fluctuations are analyzed.

(For abstract see issue 06, p. 825, Accession no. A77-17924)

The effect of superheating of vapor on the intense condensation process of vapor flow on a plate is analyzed.

A paper [1] recently published in a scientific journal summed up a recently conducted set of studies [2, 4] on the optics of heterogeneous media. A number of fundamental statements of these studies require examination.

Consideration is made of the characteristics of heat- and momentum-transfer phenomena in a forced liquid flow under conditions of surface boiling in a channel.

Consideration is made of characteristics of momentum and heat transfer phenomena in a forced liquid flow with surface boiling in a channel. Based on the physical model of this phenomenon, approximate analysis is made of the process which is valid for surface boiling of nonmetallic liquids under the conditions of sufficiently deep underheatings. The...

The present work studies the temperature field in a boundary layer of an incompressible fluid with temperature-independent physical properties on an isothermal porous plate through which uniform, homogeneous suction takes place. Analysis is carried out for a steady velocity field in the flow region. Expressions are derived for the asymptotic temper...

The conditions are analyzed under which a vaporous boundary layer separates from a cylinder in a transverse stream, with the stabilizing effect of condensation taken into account. The trend of the separation angle as a function of the heat transfer parameters is also revealed.

A method is presented for calculating the local and average heat transfer coefficients in film condensation of moving vapor of a nonmetallic fluid on a horizontal cylinder.

On the basis of von Karman integral relation a process of film condensation of moving vapour inside a vertical cylinder is considered. Relations are obtained for determination of interphase friction and pressure gradient in a condensation process in a tube. Heat transfer process is analysed for the cases of laminar and turbulent condensate film wit...

The characteristics of heat transfer in the process of fully developed nucleate boiling are examined taking into account the influence of the microgeometry of the heating surface. The dimensionless complexes characterizing the boiling process are established. An experimental study is made of the boiling process on heating surfaces with specified ad...

An analysis is presented of ponderomotive forces acting in boiling polar and neutral dielectric fluids subjected to a homogeneous and an inhomogeneous electrostatic field. An experimental study of the phenomenon is carried out, and the experimental data are compared with the results of analysis.

An approximate theory of the process of film condensation of a moving vapor within a vertical cylinder is presented. Analytical relations are obtained for calculation of the pressure gradient and of the heat-transfer coefficient in laminar and turbulent flows in the film of condensate. The results of experimental study of the process are outlined....

The results of an experimental investigation into the transition of a descending film of water into the turbulent mode of flow are presented, the film being accompanied by a stream of gas, either of the condensing variety (water vapor) or of the noncondensing kind (air).

Conceptual design of a new type solar-powered water pump (SPWP) integrated into flat plate solar collector (FPC) has been carried out. SPWP represents simple heat engine-membrane pump operating through alternating of processes of evaporation and condensation in its working chamber. It should provide circulation of water using part of absorbed by FP...

Laminar film condensation of a vapour flow along a flat plate and on the external surface of a cylinder in a transverse vapour flow is studied. Momentum transfer is shown to play a dominant part in fluid dynamics of the process itself. The results obtained are compared with the available experimental data.RésuméOn étude la condensation sous forme d...