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Central Asian Problems of Modern Science and Education

Abstract

In the article, pulsating fluid flows in tubes with changing walls, which are of great importance in biological mechanics, in particular, in the flow of blood in the arterial vessel, are investigated. The solution of the problem obtained formulas for the distribution of pressure gradient, velocity and flow rate. Impedance method analyzed the increase in hydraulic resistance depending on the frequency of oscillation. It was found that with large values 2  of hydraulic resistance grow with growth 2  . For crowding out the same flow rates, for small and with large values of the vibrational number or frequency, the energy input is different. Since for small values of the oscillatory number, fluctuations in the flow rate of the fluid fluctuate in the same phase with the oscillation of the pressure gradient, and for large values of this number, the oscillation of the phase of the fluid flow is shifted by 0 90 degrees ELECTRONIC JOURNAL OF CENTRAL ASIAN PROBLEMS OF MODERN SCENCE AND EDUCATION. MARCH, 2019-I ISSN 2181-9750 11 than fluctuations in the pressure gradient. In addition, for large values of the vibrational number, a tenfold size increases the maximum amplitude of the pressure gradient, relatively, than at low frequencies. This feature leads to an increase in the energy cost of pumping fluid due to wall oscillation

First Page

10

Last Page

17

References

[1]. Navruzov K., Xakberdiyev J.B. Dynamics of non-newtonian fluids. Tashkent: Fan, 2000. 246 p. ELECTRONIC JOURNAL OF CENTRAL ASIAN PROBLEMS OF MODERN SCENCE AND EDUCATION. MARCH, 2019-I ISSN 2181-9750 17 [2]. Pedli T. Hydrodynamics of large blood vessels.М. Mir. 1983. 400p. [3]. Fayzullaev. D.F., Navruzov K. Hydrodynamics of pulsating flows. Tashkent: Fan, 1986. 192 p. [4] Navruzov K. Hydrodynamics of pulsating flows in pipelines. Tashkent: Fan, 1986. 112 p. [5]. Navruzov K.N. Biomechanics of large blood vessels. Tashkent, “Fan va texnologiya”, 2011, 144p. [6]. Navruzov K.N., Abdukarimov F.B, Xujatov N.J. To the theory of hydraulic resistance in the pulse flow of blood in vessels with moving walls. “Ilm sarchashmalari”, UrSU, 2014, №4, p. 16-19. [7]. Navruzov K.N., Abdukarimov F.B. Hydrodynamics of pulsating blood flow. Germany, «Lap-Lambert», 2015, 209 p. [8]. Navruzov K.N. Impedance method for determining hydraulic resistance in arterial vessels (formulation of the problem). “Ilm sarchashmalari”, UrSU, 2016, №7 p.20-23 [9]. Navruzov K., Rajabov S., Shukurov Z. Impedance method for determining hydraulic resistance in large arterial vessels with permeable walls. “Ilm sarchashmalari”, UrSU, 2017, №4, p. 20-23. [10]. Navruzov K., Rajabov S., Shukurov Z. About pulsatory flow in large arterial vessels, taking into account the permeability of the wall. “Ilm sarchashmalari”, UrSU, 2017, №11, p.31-37 [11]. Abdikarimov F.B., Navruzov K.N., Rzhabov S.X., Shukurov Z.K. Impendant methad for determining the reduction of hydraulic resistance in large arterial vessels with permafle walls. “Jurnal of applied biotechnology and Bioengineering”, 2018.5(2) 79-82 [12]. Navruzov K.N., Rzhabov S.X., Shukurov Z.K., Begjanov A. Sh. On the reduction of the resistance in the central arterial vessel. “Asian Journal of research”, № 12.(12).2017, 20-31

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