METHOD FOR DETERMINING HYDRAULIC RESISTANCE DURING FLUID FLOW IN PIPES

Author: Navruzov Kuralbay, Shukurov Zoxid Kuchkarovich, Begjanov Amirbek Shixnazarovich

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  α 2  of hydraulic resistance grow with  growth   α 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  90 0  degrees  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.