Thermal conductivity of fluid

Ug = mean mixer side film coefficient of tank temperature k = thermal conductivity of fluid, Btu/hr/sq ft/°F/ft d = d, = tube OD, ft T = tank diameter, ft... 

Da = diameter of agitator, ft k = thermal conductivity of fluid processed,... 

Nusselt Nu Thermal conductivity of fluid Dimension of surface Heat transfer coefficient... 

Prandtl Pr Specific heat capacity of fluid Viscosity of fluid Thermal conductivity of fluid... 

In order to take into account the effect of surface tension and micro-channel hydraulic diameter, we have applied the Eotvos number Eo = g(pL — pG)d /(y. Eig-ure 6.40 shows the dependence of the Nu/Eo on the boiling number Bo, where Nu = hd /k] is the Nusselt number, h is the heat transfer coefficient, and k] is the thermal conductivity of fluid. All fluid properties are taken at the saturation temperature. This dependence can be approximated, with a standard deviation of 18%, by the relation ... 

The transfer of heat and/or mass in turbulent flow occurs mainly by eddy activity, namely the motion of gross fluid elements that carry heat and/or mass. Transfer by heat conduction and/or molecular diffusion is much smaller compared to that by eddy activity. In contrast, heat and/or mass transfer across the laminar sublayer near a wall, in which no velocity component normal to the wall exists, occurs solely by conduction and/or molecular diffusion. A similar statement holds for momentum transfer. Figure 2.5 shows the temperature profile for the case of heat transfer from a metal wall to a fluid flowing along the wall in turbulent flow. The temperature gradient in the laminar sublayer is linear and steep, because heat transfer across the laminar sublayer is solely by conduction and the thermal conductivities of fluids are much smaller those of metals. The temperature gradient in the turbulent core is much smaller, as heat transfer occurs mainly by convection - that is, by... 

Lo undiluted bed length m Ar thermal conductivity of fluid phase Jm s- K-1... 

Xq, Xs thermal conductivity of fluid and of solid particle (kcal/hm °K)... 

S.U.S. Choi, Enhancing Thermal Conductivity of Fluids with Nanoparticles , Developments and Applications of Non-Newtonian Flows, eds. D A. Singer and H.P. Wang (1995) FED 231, 99-105, American Society of Mechanical Engineers, New York. 

S. Lee, S.U.S. Choi, S. Li and J.A. Eastman, Measuring thermal conductivity of fluids containing oxide nanoparticles. Journal of Heat Transfer, 121, 280-289 (1999). 

Beck E (1976) An improved method of computing the thermal conductivity of fluid-filled sedimentary rocks. Geophysics 4i(i) i33-i44... 

THERMAL CONDUCTIVITY OF FLUIDS. METHANE. CARMICHAEL LT REAMER H H SAGE B H J CHEM ENG DATA... 

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