scholarly journals Step Excrescence Effects for Manufacturing Tolerances on Laminar Flow Wings

2010 ◽  
Author(s):  
Aaron Drake ◽  
Anne Bender ◽  
Andrea Korntheuer ◽  
Russell Westphal ◽  
Wayne Rohe ◽  
...  
Keyword(s):  
Laminar Flow ◽  
Manufacturing Tolerances

Manufacturing Tolerances for Natural Laminar Flow Airframe Surfaces

1985 ◽  
Author(s):  
Bruce J. Holmes ◽  
Clifford J. Obara ◽  
Glenn L. Martin ◽  
Christopher S. Domack
Keyword(s):  
Laminar Flow ◽  
Manufacturing Tolerances ◽  
Natural Laminar Flow

Effects of Nonuniform Passages on Compact Heat Exchanger Performance

1980 ◽  
Vol 102 (3) ◽  
pp. 653-659 ◽  
Author(s):  
R. K. Shah ◽  
A. L. London
Keyword(s):  
Heat Exchanger ◽  
Laminar Flow ◽  
Heat Transfer Performance ◽  
Compact Heat Exchanger ◽  
Reduced Pressure ◽  
Nusselt Numbers ◽  
Friction Factors ◽  
Special Cases ◽  
Longitudinal Wall ◽  
Manufacturing Tolerances

Neighboring passages in a compact heat exchanger such as a rotary regenerator are never geometrically identical due to manufacturing tolerances. This passage-to-passage nonuniformity can result in a significant penalty on heat transfer performance with only a small compensating effect of reduced pressure drop. Continuous cylindrical passage geometries, operating with laminar flow, are particularly sensitive to these effects. In this paper, a procedure is outlined to establish the effective friction factors and Nusselt numbers for one fluid side of an exchanger having n different cylindrical passage geometries. Two special cases of longitudinal wall temperature variation are considered corresponding to conditions of Cmin/Cmax of zero and unity. The analysis is presented for both fully developed and developing laminar flow.

Laminar Flow Gas Turbine Regenerators—The Influence of Manufacturing Tolerances

1970 ◽  
Vol 92 (1) ◽  
pp. 46-56 ◽  
Author(s):  
A. L. London
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Laminar Flow ◽  
Gas Turbine ◽  
Metal Foil ◽  
Friction Behavior ◽  
Flow Type ◽  
F Factor ◽  
Manufacturing Tolerances ◽  
The Difference

Several current designs for high effectiveness gas turbine regenerators involve low Reynolds number fully developed, laminar flow type surfaces. Such surfaces consist of cylindrical flow passages, of small hydraulic radius, in parallel. The cylinder geometry may, as examples, be triangular, as in some glass-ceramic surfaces, or rectangular, as in deepfold metal foil surfaces. This presentation demonstrates that manufacturing tolerances of several thousandths of an in. in passage dimension have a significant influence on the overall heat transfer and flow friction behavior. The analysis is also useful in rationalizing the difference between theory and test results for the basic heat transfer (j factor) and friction (f factor) characteristics as a function of Reynolds number for various surfaces of the laminar flow type.

HYDRODYNAMICALLY DEVELOPED LAMINAR FLOW OF NON-NEWTONIAN FLUIDS INSIDE DOUBLE-SINE DUCTS

2001 ◽  
Vol 3 (2-3) ◽  
pp. 16 ◽  
Author(s):  
C. L. Chaves ◽  
Joao N. N. Quaresma ◽  
E. N. Macedo ◽  
L. M. Pereira ◽  
J. A. Lima
Keyword(s):  
Laminar Flow ◽  
Newtonian Fluids
Sign in / Sign up

Export Citation Format

Share Document