Wyniki wyszukiwania - BazTech

1

Koncepcja stanowiska do badania wrzenia wody w kanałach poziomych

Dratwa J.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

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2015

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z. 105

49-52

EN

Article present the concept of research station for boiling water inside horizontal channels. It will be built research station to take results of heat transfer coefficient for poor water and water – oil mixture. Result will be placed in data base and compared with literature results for boiling carbon dioxide, ammonia and hydrocarbons. Then it will attempt to create methods to provide heat transfer coefficient of natural refrigerants boiling.

2

Badania wstępne identyfikacji struktur przepływu mieszaniny dwufazowej w minikanałach poziomych

Wacławczyk P.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

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2015

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z. 105

223-224

EN

Two-phase flow is used in many branches of industry. Flow patterns are very important because of their impact on many physical aspects of the two-phase flow. Because of this fact and pervasive miniaturization of devices, it was decided to carry out flow hydrodynamic research in small diameter channels.

3

Exact solution of an oscillatory MHD flow in a channel filled with porous medium

Singh K. D.

International Journal of Applied Mechanics and Engineering

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2011

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Vol. 16, no 1

277-283

EN

An exact solution of an oscillatory MHD flow of a viscous, incompressible and electrically conducting fluid in an infinite horizontal channel is presented. The channel is filled with a porous medium and a magnetic field is applied perpendicular to the plates of the channel. During the analysis it is found that the mathematical formulation and the solution obtained of the problem by Makinde and Mhone (2005) are both wrong. Equations (2.1) to (2.4) do not govern the flow problem shown geometrically in their Fig.1. This important flow problem is again formulated mathematically in the present paper and a fresh and a correct closed form analytical solution is obtained. The validity and correctness of the present solution is verified by the limiting case for H=s=0. In this case of oscillatory flow in the absence of a magnetic field and through ordinary medium the solution reduces to the well known result obtained by Schlichting and Gersten (2001). The results are discussed in detail with the help of graphs for the variations of different flow parameters.

4

Unsteady flow and heat transfer of three immiscible fluids

Umavathi J. C., Shaik Meera D., Liu I. C.

International Journal of Applied Mechanics and Engineering

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2008

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Vol. 13, no 4

1079-1100

EN

The problem of unsteady flow and heat transfer of three immiscible viscous fluids has been studied in a horizontal channel. The fluids in all the three regions are assumed to be incompressible with different viscosities and thermal conductivities. The channel walls are maintained at two different constant temperatures. The partial differential equations governing the flow are transformed to ordinary differential equations using the exponential function of periodic frequency parameter and exact solutions are found. The expressions for velocity and temperature distributions are computed numerically for different values of physical parameters governing the flow and the results are presented graphically. It is found that the flow can be controlled choosing suitable values of ratios of viscosities, height ratios, pressure, conductivity ratios, the Eckert number, frequency parameter and periodic frequency parameters. In addition, closed form expression for the rate of heat transfer at the top and bottom walls are derived and are tabulated.

5

Fully developed flow and heat transfer in a horizontal channel containing an electrically conducting fluid sandwiched between two fluid layers

Umavathi J. C., Malashetty M. S., Mateen A.

International Journal of Applied Mechanics and Engineering

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2004

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Vol. 9, no 4

781-794

EN

The problem of fully developed flow and heat transfer in a horizontal channel consisting of an electrically conducting fluid layer sandwiched between two fluid layers is studied analytically. The fluids in all phases are assumed to be incompressible and immiscible. Further the fluids are assumed to have different viscosities and thermal conductivities. The governing differential equations are linear and exact solutions are obtained. The expressions for velocity and temperature distributions are computed numerically for different values of physical parameters and the results are presented graphically. The effect of increasing the Hartmann number M is to decrease the velocity and temperature field. It is found that with suitable values of ratios of viscosities and thermal conductivities, the velocity and temperature can be increased.