Head: Vitaliy K. Pershin, DSc, professor
Tel/Fax: (+7 343) 221-24-37
In connection with the reform of university chairs and optimization of the educational process in September 2011, "Chemistry" discipline was transferred to Physics Chair. Based on this decision, the Academic Council of 22.09.2011 gave the chair a different name: "Physics and Chemistry", which is more relevant to its academic profile and research areas.
Computer modeling of heat processes in friction
V.K. Pershin, DSc, professor
L.A. Fishbane, PhD, associate professor
Space and time distribution of temperature fields and fields of heat flows in heavy duty friction units (wheel-brakes-rail) can be modeled on the basis of transient heat conductivity in the moving medium, for the boundary problem with boundary conditions of conjugation within analytical and numerical methods of finite elements. The results obtained by means of computer modeling allow to define temperature distribution during braking process in a friction unit depending against physic technical characteristics of a wheel and a rail. It is also possible to create engineering methods of calculating heat exchange in friction resting upon these characteristics.
The installation to control controlling coils, applied for partition of magnetically operated sealed switches to actuating currents was suggested. The correlation analysis helps to identify places in the coils, which provide better conformities between currents. The installation developed allows to detect weak magnetic fields and it can be applied in magnetic flaw detection, for coils control and to analyze electric machinery functioning.
Two devices for contactless control over a current-carrying cable at railway transport were created. The devices can be placed in a special train car, moving at the speed of 40-60 km/h. These devices are described in two separate patents. First one is based on avalanche ionization of an inert gas in a dielectric body of a lamp situated close to the contact wire-line. Second device - on induced activity formation of ionizing radiation in a copper wire, when it is exposed to deceleration radiation of a betatron.
The method for achieving bubble boiling, which is characterized by much greater stability because temperature interval of stable bubble boiling is many times bigger and reverse transfer from film to bubble boiling goes with no hysteresis effect. The major advantage of the suggested method (besides the increase of heat exchange intensity) is that no intervention in the cooled object is needed and the object doesn't have to be modernized in any way to apply this method. It is needed to take thermal liquid in use (e.g. water) and put in about 1-2 volume % of another liquid, insoluble in the first one and with boiling point lower then that of the cooled surface (for water it can be freon-12). To reduce added fluid consumption, the cooling outline must be closed.