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Author: mark kedzierski

Displaying records 81 to 87.
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81. Simultaneous Visual and Calorimetric Measurements of R11, R123, and R123/Alkylbenzene Nucleate Flow Boiling (NISTIR 4948)
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 4948
Published: 10/1/1992
Author: Mark A Kedzierski
Abstract: 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 thr ...

82. Causes of the Apparent Heat Transfer Degradation for Refrigerant Mixtures
Published: 8/9/1992
Authors: Mark A Kedzierski, J. H. Kim, David Didion
Abstract: 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 ...

83. Comparison of Experimental Measurements of Local Flow Boiling Heat Transfer Coefficients for R11 and R123
Published: 1/1/1991
Authors: Mark A Kedzierski, David Didion
Abstract: 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 t ...

84. Practical Fin Shapes for Surface-Tension-Drained Condensation
Published: 5/1/1990
Authors: Mark A Kedzierski, R. L. Webb
Abstract: 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 g ...

85. Visualization of Nucleate Flow Boiling for an R22/R114 Mixture and Its Components
Published: 1/1/1990
Authors: Mark A Kedzierski, David Didion
Abstract: 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 ...

86. Experimental Measurements of Condensation on Vertical Plates With Enhanced Fins
Published: 1/1/1987
Author: Mark A Kedzierski
Abstract: 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 su ...

87. R134a/Al^d2^O^d3^ Nanolubricant Mixture Pool Boiling on a Rectangular Finned Surface
Published: 10/31/0012
Author: Mark A Kedzierski
Abstract: This paper quantifies the influence of Al2O3 nanoparticles on the pool boiling performance of R134a/polyolester mixtures on a rectangular finned boiling surface. Nanolubricants with 10 nm diameter Al2O3 nanoparticles of various volume fractions (1Al ...

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