Conversion in chemical reactions for isothermal laminar flow of non-Newtonian liquids in a tubular reactor of circular cross-section

1966 ◽  
Vol 21 (5) ◽  
pp. 405-411 ◽  
Author(s):  
Z. Novosad ◽  
J. Ulbrecht
Keyword(s):  
Laminar Flow ◽  
Cross Section ◽  
Chemical Reactions ◽  
Circular Cross Section ◽  
Tubular Reactor ◽  
Newtonian Liquids

Hot-Wire Measurements of Turbulence Correlations in a Triangular Duct

1962 ◽  
Vol 29 (4) ◽  
pp. 609-614 ◽  
Author(s):  
C. J. Cremers ◽  
E. R. G. Eckert
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Cross Section ◽  
Circular Tube ◽  
Turbulent Transport ◽  
Circular Cross Section ◽  
Hot Wire ◽  
Round Tube ◽  
Flow Through ◽  
Hot Wires

Previous studies by flow visualization have indicated that the flow through a duct of triangular cross section is in its characteristics quite different from flow through a duct with circular cross section. They revealed among others that purely laminar flow exists in the corners of the duct even though the bulk of the fluid moves in turbulent motion. Heat-transfer measurements in such a duct appear to indicate that the turbulent transport in the direction of the height of the duct is considerably smaller than expected from circular tube measurements. The present paper reports the measurements of turbulent correlations for turbulent flow through such a duct. These measurements have been made with hot wires of very small dimensions. They again reveal the existence of a laminar corner region. In the bulk of the fluid, the differences of the correlations to those in a round tube turned out to be smaller than originally suspected.

Developing laminar flow in a pipe of circular cross-section

1971 ◽  
Vol 321 (1547) ◽  
pp. 461-476 ◽  
Keyword(s):  
Laminar Flow ◽  
Cross Section ◽  
Analytical Approach ◽  
Circular Cross Section ◽  
Isothermal Flow ◽  
Experimental Measurements ◽  
Temperature Dependent ◽  
Temperature Dependent Viscosity ◽  
Flow Development ◽  
Dependent Viscosity

A method is described of predicting flow development and pressure drop in the inlet of a uniform pipe of circular cross-section for the incompressible isothermal laminar flow of a Newtonian fluid. Employment of both the differential and integral momentum equations leads to greater simplicity of expression than is found in other theoretical treatments, though the solutions obtained compare equally favourably with the limited experimental measurements available; those reported herein suggest the need for a more generalized analytical approach which covers non-isothermal flow and the effect on flow development of temperature-dependent viscosity.

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