All liquids have the properties of cohesion and adhesion, but from liquid to liquid varies according to the qualities of the liquid and also have the active role of the obstruction of the fluid and thank less efficiency and also depends on the shape and type of tube conveyor. And thank my colleagues for all the answer
Interesting question. I am waiting for expert views from colleagues like Prof. Emad and Prof. Ljubomir whom I know are great scholars in this field. Best regards
Thank you my colleague Dr. Dickson Adom and Dr. Jawad Ali for your answer
Best Regards
Dr. Malik
Although the subject is not the core of the specialist, but it is known that these two characteristics of cohesion and adhesion play an important role in the speed of fluid flow in addition to the nature of the carrier surface of liquid
Thank you my colleague Dr. Salam Jassim Hmood for you answer
Best Regards
Dr. Malik
The flow rate at the central part will be higher because the cohesion is stronger ... than the flow rate at the side liquid contact with the other kind of surface which the adhesion is stronger.
The example is the flow rate of the blood in the vessels (arteri) in our body.
The principles of fluid movement are the laws of retention, specifically, the law of material survival, the maintenance of linear momentum (also known as Newton's Second Law of Motion), and energy retention (also known as the First Law of Thermodynamics). Fluid movement is based on classical mechanics and does not take into account modifications of quantum mechanics that are concerned with the micro-state of matter within atoms and elementary particles or the special relativity effect that takes into account very large velocities near the speed of light. Reynolds' theory is also one of the fundamentals of fluid dynamics.
In addition to the above, liquid fluid is assumed to have properties such as viscosity. Fluids consist of molecules in a constant thermal movement and collide with each other. The assumption of fluid continuity is that liquids are continuous and not separate. Therefore, we are concerned with properties such as density, pressure and temperature, which determine the state of the fluid, and also determine the distribution of velocities between the molecules. In the case of liquids dense enough to form connected satellites, their velocities are much less than the speed of light, so they are treated according to the laws of Newton, Ionize it.
Fluid flow equations are equations based on Newton's laws, including the Stokes Act, which is a nonlinear set of differential equations that describe flow of liquid, which is written linearly on the gradients of velocity and pressure. The equations can be simplified in several ways, making them easier to solve.
Interesting question. Above all, there are extensive and rich information on the properties of cohesion and adhesion in liquids in many books and scientific sources. But here I would like to clarify the role of these forces in achieving the poetic characteristic, which without the occurrence of this property, has not lived on the ground. For example, these forces play an important role in our lives. They play a major role in achieving the poetic characteristic responsible for blood filtration in the kidneys, as in the ureter (the narrow tube that reaches the kidney to the bladder to reduce the urine droplets to the bladder). So that urine does not return to the kidneys and leads to kidney failure. As a result of these forces, the water in the plants is pulled in the pores of small diameters in a direction opposite to the gravity above the level of the groundwater, to form a wet area called the area of water capillaries. This area is usually larger in soil with soft grains than in rough coarse soils because the diameter of the pores is smaller. Thus, these forces have a very important effect on the movement of liquids, through the cohesion of liquid molecules with each other on the one hand, and on the other hand adhesion of liquid molecules with the surfaces touching them.
I thank all my colleagues who answered my question or did not answer my question. I say that you were in my respect and sincere appreciation. My thanks and appreciation
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