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Search Publications by: Mark A. Kedzierski (Assoc)

Displaying 126 - 131 of 131

Simultaneous Visual and Calorimetric Measurements of R11, R123, and R123/Alkylbenzene Nucleate Flow Boiling (NISTIR 4948)

October 1, 1992

Author(s)

Mark A. Kedzierski

Bubble formation during horizontal flow boiling of trichlorofluoromethane (R11), 1,1-dichloro-2,2,2-trifluoroethane (R123) and two R123/alkylbenzene lubricant mixtures was investigated both visually and calorimetrically. The test fluid was pumped through

Causes of the Apparent Heat Transfer Degradation for Refrigerant Mixtures

August 9, 1992

Author(s)

Mark A. Kedzierski, J. H. Kim, David Didion

This paper presents an investigation into the causes of the apparent heat transfer degradation associated with horizontal-annular flow evaporation of refrigerant mixtures. The apparent heat transfer degradation is the difference between the measured heat

Comparison of Experimental Measurements of Local Flow Boiling Heat Transfer Coefficients for R11 and R123

January 1, 1991

Author(s)

Mark A. Kedzierski, David Didion

This paper presents a comparison of the measured horizontal, smooth-tube, flow boiling heat transfer coefficient of R11 to that of its proposed ozone safe replacement R123. The fluid properties of R11 and R123 are similar. The flow boiling data for the two

Practical Fin Shapes for Surface-Tension-Drained Condensation

May 1, 1990

Author(s)

Mark A. Kedzierski, R. L. Webb

This paper introduces a new family of high-performance fin profiles for surface-tension-drained condensation. Previously described profiles for this situation have been defined in terms of the fin curvature and arc length. The existing profiles are

Visualization of Nucleate Flow Boiling for an R22/R114 Mixture and Its Components

January 1, 1990

Author(s)

Mark A. Kedzierski, David Didion

Visualization of bubble nucleation during forced-convective flow inside a horizontal, electrically heated quartz tube was done in order to establish a comparison of this phenomenon between refrigerant mixtures and their pure components. The specific

Experimental Measurements of Condensation on Vertical Plates With Enhanced Fins

January 1, 1987

Author(s)

Mark A. Kedzierski

Fins were accurately machine on vertical plates with the electric discharge (EDM) process. Condensation heat transfer data for various fin shapes were used to experimentally demonstrate the importance of large curvature and curvature gradients for surface