Numerical investigation of the Ostrogradsky number effect on natural convection and thermal radiation in an enclosure

Unsteady natural convection combined with surface thermal radiation in closed cavity with a local heat-generating source has been investigated. The heat source of triangular shape of internal volumetric heat generation is located on the bottom wall. The vertical side walls are supposed to be isothermal and cooled. The governing equations of conservation of momentum, mass and energy, described the fluid flow and heat transfer have been represented by dimensionless variable "stream function - vorticity - temperature". The effects of the heat source power and emissivity factor on fluid flow and heat transfer within the cavity have been analyzed. Streamlines and isotherms as well as fluid flow rate, the local Nusselt numbers, average convective and radiative Nusselt numbers have been obtained

Ignition of typical gel-fuel at local heating

In this paper, we determined the ignition delay for a typical gel fuel by metal particles of various form. Also, determined the ignition delay times by varying the initial particle temperature

Разработка мероприятий по предупреждению аварийной ситуации на объекте энергетики

Выпускная квалификационная работа посвящена исследованию мазутного хозяйства на объекте энергетики и мерам безопасности для данного вида работ. Определению причин чрезвычайных ситуаций путем построения дерева причин.The final qualifying work is devoted to the study of fuel oil facilities at the energy facility and safety measures for this type of work. Identify the causes of emergencies by building a tree of causes

The gas–liquid phase-transition singularities in the framework of the liquid-state integral equation formalism

6 pages, 4 figures.-- PACS: 64.70.Fx; 65.20.+w; 02.30.Rz; 62.10.+sThe singularities of various liquid-state integral equations derived from the Ornstein–Zernike relation and its temperature derivatives, have been investigated in the liquid–vapor transition region. As a general feature, it has been found that the existence of a nonsolution curve on the vapor side of the phase diagram, on which both the direct and the total correlation functions become complex—with a finite isothermal compressibility—also corresponds to the locus of points where the constant-volume heat capacity diverges, in consonance with a divergence of the temperature derivative of the correlation functions. In contrast, on the liquid side of the phase diagram one finds that a true spinodal (a curve of diverging isothermal compressibilities) is reproduced by the Percus–Yevick and Martynov–Sarkisov integral equations, but now this curve corresponds to states with finite heat capacity. On the other hand, the hypernetted chain approximation exhibits a nonsolution curve with finite compressibilities and heat capacities in which, as temperature is lowered, the former tends to diverge.E.L. acknowledges financial support of the Dirección General de Investigación Científica y Técnica under Grant No. FIS2004-02954-C03-01. This work has been carried out under the auspices of the exchange agreement between the Consejo Superior de Investigaciones Científicas and the Russian Academy of Sciencies, which supported the exchange visits of E.L. and G.S. in the past two years.Peer reviewe

Інвестиційна політика як один з пріорітетних шляхів розвитку економіки регіонів

В сучасних умовах спаду економічного розвитку регіонів важливу роль відіграють пошуки нових напрямів в регіональній реформі. На сучасному етапі дуже мало приділяється уваги новаторським питанням. Таким чином, розвиток інноваційної діяльності суб’єктів господарювання регіону може бути використаний як дієвий чинник економічного оздоровлення