Talk:Blood
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Blood is a tissue, blood thickness is characterized by its inner frictions[edit]
Blood is a tissue made of many formed elements (cells, fibres, proteins, clots, packs, plugs, aggregates, macromolecules) constituting around 50% of the volume. More than carrying gas, solids and fluids, blood is made of all these fundamental states. The formed elements never stay at the same place. The rest of blood is serum. We call, plasma, blood without red cells and white cells and sometimes without immunoproteins. Blood is heterogeneous because the formed elements migrate and change of distribution depending on the flows situations (rotation, straight flows, sedimentation, filtration, smear, drop). Blood is discontinuous because the formed elements breack the continuity of atomic bonds in the serum. There is a blood friction due to blood composition distribution in movements. Blood thickness is as Thurston said : a combination of a plug flow and a free cells layer. Formed elements benefit from drag, lift and inertial forces. They shock, rub between each others and draw different patterns according to blood composition and vessels and pressure and streams conditions. Usually we observe platelets and white cells close to the vessels walls and red cells in a central plug flow. There is a sheath flow made of plasma around the plug flow.
In blood, formed elements chock and adhere differently than in a fluid. Blood thickiness is different than a fluid viscosity . In blood, viscosity is of poor action compared to formed elements.
There are many fluids mechanics models for continuous fluids interested in blood flow saying blood is a complex fluid with a non Newtonian fluid behaviour. A fluid is characterized by continuous atomic or molecular bonds. Serum can be a fluid, a biofluid. In incompressible fluids flows, the fluid data is the dynamic viscosity. The rest of the flow depends on boundary conditions which are geometrical and material (mass flow rate, pressure) and depends on the model of study (Navier Stokes, Poiseuille, Newton, Lagrange, Couette for examples). Viscosity is coming from the friction between parallel layers of different velocities due to atomic and molecular adherence and brownian chocs inside the fluid. — Preceding unsigned comment added by 193.57.120.24 (talk) 17:04, 15 November 2016 (UTC)
- I agree with you!.--Bolzanobozen (talk) 15:18, 27 August 2017 (UTC)
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Litre[edit]
There is one "litre" and four "liters". --5.43.68.69 (talk) 14:49, 22 June 2018 (UTC)
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