ДОСЛІДЖЕННЯ НЕСТАЦІОНАРНИХ НАПІРНИХ ТЕЧІЙ У ТРУБАХ НА ОСНОВІ МАТЕМАТИЧНИХ МОДЕЛЕЙ
Journal Title: Вісник Національного університету "Львівська політехніка". Серія "Теорія та практика будівництва" - Year 2017, Vol 0, Issue 877
Abstract
The article deals with mathematical modeling of non-stationary processes non-periodic pressure of the fluid in cylindrical tubes. Based on the Navier-Stokes equations for compressible fluid withdrawn simplified equation for the case of long pipes. It is shown that modeling of single processes, these equations contain only one dimensionless parameter. Identifies conditions which may further simplify these equations to a form that does not contain a dimensionless parameter. Total non-periodic accelerated research process is based on the review model problem for which elected a process in tube for instant pressure changes. Specified the conditions under which you can go to traffic patterns and incompressible fluid movements with high attenuation. The criterion of the transition from laminar to turbulent motion mode that allows you to determine the scope of application of these models movement.To date, no theory calculation since buckling laminar flow regime and transition to a turbulent unsteady flows and therefore no limits applicability of the above models laminar motion, making it necessary to use physical simulation results obtained from experimental data.
Authors and Affiliations
R. Hnativ, M. Bosak, I. Hnativ
Keywords
Related Articles
- EP ID EP284728
- DOI -
- Views 87
- Downloads 0
ЕКСПЛУАТАЦІЙНИЙ СТАН, РЕКОНСТРУКЦІЯ ТА РЕЗУЛЬТАТИ ВИПРОБУВАНЬ РЕКОНСТРУЙОВАНОГО АВТОДОРОЖНЬОГО ШЛЯХОПРОВОДУ
The small and medium span bridges constructed in the 50-60s of the last century with span structures of prefabricated reinforced concrete beams according to the typical project of 1956 year currently do not meet modern e...
Стабілізація гідравлічних режимів у системі теплохолодопостачання на основі енергії холодної води і вентиляційного повітря
The heat – cooling supply system of a building on the base of integrated energy of cold water and air flows with heat - pumping installation is suggested. The features of air movement in the pipeline, which connects the...
USING IMPROVED DESIGN METHOD OF SHEER STRENGTH OF REINFORCED CONCRETE BEAMS
The analysis of the efficiency of six types of slabs has been carried out, which differed in material, internal form and weight. The comparison and the comparison of the same in size, but different in constructive char...
ANALYSIS OF THE FATIGUE STRENGTH OF RESTING NODES OF MULTIPLE-ROPE FRICTION PULLEYS OF A FRAMED SHAFT HEADGEAR
The paper comprises the results of the analysis of the fatigue strength of the framed shaft headgear structures, among them a multiple-rope hoisting plant, resting nodes of guide pulleys. The analysis was carried out on...
Ventilation duct sizing tools - tradition and modernity
One of the most important problems in the hydraulic design of various building services systems is the calculation of the friction factor involved in Darcy-Weisbach equation. Ventilation duct sizing is a good case study,...