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Search Publications by: Mark A. Kedzierski (Assoc)

Displaying 101 - 125 of 131

Use of Fluorescence to Measure the Lubricant Excess Surface Density During Pool Boiling

January 1, 2001

Author(s)

Mark A. Kedzierski

This paper presents what are believed to be the first measurements of the non-adiabatic lubricant excess surface density on a roughened, horizontal flat pool-boiling surface. Both pool boiling heat transfer data and lubricant excess surface density data

Refrigerant/Lubricant Mixture Boiling Heat Transfer Research at NIST

September 1, 2000

Author(s)

Mark A. Kedzierski

This paper overviews the boiling heat transfer research of the recent few years at NIST (National Institute of Standards and Technology) on refrigerant/lubricant mixtures. The aim of the research was to fundamentally understand the effects of lubricant

Evaporation and Condensation Heat Transfer Performance of Flammable Refrigerants in Brazed Plate Heat Exchangers

July 1, 2000

Author(s)

Mark A. Kedzierski, J C. Chato, T J. Rabas

Measured overall Nusselt numbers were determined for R22, R290, R290/600a, and R32/152a undergoing evaporation and condensation in a brazed plate heat exchanger. The refrigerants experienced wavy, stratified flow at low heat and mass fluxes, 1.3 to 8.3 kW

The Effect of Lubricant Concentration, Miscibility, and Viscosity on R134a Pool Boiling

January 1, 2000

Author(s)

Mark A. Kedzierski

This paper presents pool boiling heat transfer data for twelve different R134a/lubricant mixtures and pure R134a on a Turbo-BIITM-HP surface. Themixtures were designed to examine the effects of lubricant mass fraction, viscosity, and iscibility on the heat

A Simple Prediction Method for Condensation Heat Transfer Inside a Micro-fin Tube

November 1, 1999

Author(s)

F M. Donati, Mark A. Kedzierski

This study examines an alternative method for modeling in-tube condensation heat transfer. The method's fundamental premise is that the heat flux is directly proportional to the difference between the enthalpy of the vapor at saturated free stream

Effect of Heating Boundary Conditions on Pool Boiling Experiments

October 1, 1999

Author(s)

J Darabi, M M. Ohadi, M A. Fanni-Tabrizi, S V. Dessiatoun, Mark A. Kedzierski

The two widely used experimental methods for pool boiling experiments are evaluated. Boiling heat transfer data employing either the water or electric heating method obtained by various researchers are compared and discussed. The electric heating method is

The Effect of a Boiling Additive on R123 Condensation on a Vertical Integral-Fin Surface

March 1, 1999

Author(s)

Mark A. Kedzierski

This paper examines the effect of the addition of 0.5% mass isopentane to R123 on thevapor-space condensation heat transfer of R123.In a previous study, the pool boiling performance of R123 was improved by adding 0.5% mass isopentane. Consequently, the

Enhancement of R123 Pool Boiling by the Addition of N-Hexane

January 1, 1999

Author(s)

Mark A. Kedzierski

This paper presents the heat transfer data used to file international patent WO 94/18282. The data consisted of pool boiling performance of a GEWA-TTM surface for three fluids: (1) pure R123, (2) R123/n-hexane (99/1), and (3) R123/n-hexane (98/2). The heat

Enhancement of R123 Pool Boiling by the Addition of Hydrocarbons

October 1, 1998

Author(s)

Mark A. Kedzierski

This paper present pool boiling heat transfer data for ten different R123/hydrocarbon mixtures. The data consisted of pool boiling performance of a GEWA-T TM surface for pure R123 and for ten dilute solutions of five different hydrocarbons: (1) pentane, (2

Ralph Webb: A Pioneering Proselytizer for Enhanced Heat Transfer

October 1, 1998

Author(s)

Mark A. Kedzierski

Ralph Webb, a pioneer in enhanced heat transfer, proselytizes his field for the economic and technical benefit of industry. His mission has been, and always will be, the promotion of enhanced heat transfer technology. As a result, he has been instrumental

A New Insitu Technique for Measuring the Concentration of Lubricant on a Boiling Heat Transfer Surface

January 1, 1998

Author(s)

Mark A. Kedzierski, Thomas J. Bruno, Matt O'Neill

The paper presents a technique for using the fluorescent properties and/or the harmonic focusing properties of several commercial lubricants to measure the concentration of lubricant on an aluminum vignetting target. It is planned to use the measurement

Convective Boiling and Condensation Heat Transfer With a Twisted-Tape Insert for R12, R22, R152a, R134a, R290, R32/R134a, R32/R152a, R290/R134a, R134a/R600a

January 1, 1998

Author(s)

Mark A. Kedzierski, Min S. Kim

Measured, local-average Nusselt numbers (Nu) for in-tube, convective boiling and condensation with a twisted-tape insert are presented for: R12, R22, R152a, R134a, R290, R32/R134a, R32/R152a, R290/R134a, and R134a/R600a. The heat transfer data were

Horizontal Convective Condensation of Alternative Refrigerants Within a Micro-Fin Tube

December 1, 1997

Author(s)

Mark A. Kedzierski, J Goncalves

This paper presents Local convective condensation Measurements for four refrigerants: R134, R410A (R32/R125, 50/50 % mass), R125, and R32 in a micro-fin tube. Both heat transfer and pressure drop measurements are provided. The heat transfer degradation

Effect of Inclination on the Performance of a Compact Brazed Plate Condenser and Evaporator

January 1, 1997

Author(s)

Mark A. Kedzierski

This study experimentally quantified the change in heat transfer and pressure drop associated with tilting a compact brazed plate heat exchanger from the intended vertical position. Both clockwise and counterclockwise rotations within a plane perpendicular

Horizontal Flow Boiling of Alternative Refrigerants Within a Fluid Heated Micro-Fin Tube.

November 16, 1996

Author(s)

M P. Kaul, Mark A. Kedzierski, David Didion

This paper presents local, fluid-heated, flow boiling measurements for three refrigerant mixtures: [1] R410B (R32/125, 45/55 % mass), [2] R32R134a (28/72 % mass) and [3] R407C (R32/125/134a, 25/23/52 % mass). Flow boiling heat transfer coefficients for the

Enhancement of R123 Pool Boiling by the Addition of N-Hexane (NISTIR 5780)

March 1, 1996

Author(s)

Mark A. Kedzierski

Single-Phase Heat Transfer and Pressure Drop Characteristics of an Integral-Spine Fin Within an Annulus (NISTIR 5454)

January 1, 1996

Author(s)

Mark A. Kedzierski, M S. Kim

The laminar, single-phase heat transfer and friction characteristics of a porcupine-like surface (integral-spine-fin) within an annulus are presented. The heat-transfer coefficient was determined using a modified version of the Wilson Plot method on a 3 m

Calorimetric and Visual Measurements of R123 Pool Boiling on Four Enhanced Surfaces (NISTIR 5732)

November 1, 1995

Author(s)

Mark A. Kedzierski

Pool boiling of R123 on four commercial enhanced surfaces was investigated both calorimetrically and visually. The four surfaces were: (1) Turbo-BII(TM) (2) High-Flux(TM) (3) GEWA-K(TM), and (4) GEWA-T(TM). The surfaces were either machined or soldered

Calorimetric and Visual Measurements of R123 Pool Boiling on Four Enhanced Surfaces.

November 1, 1995

Author(s)

Mark A. Kedzierski

Effect of Inclination on the Performance of a Compact Brazed Plate Condenser and Evaporator (NISTIR 5767)

November 1, 1995

Author(s)

Mark A. Kedzierski

Visual Measurement Technique for Analysis of Nucleate Flow Boiling (NISTIR 5519)

October 1, 1994

Author(s)

Mark A. Kedzierski, J. M. Crowder, A. M. Jacobi, L. Zhang

This report records a visual measurement technique for analyzing bubbles formed by nucleate flow boiling. The purpose of measuring these bubbles is to expand understanding the boiling process. By studying the behavior of these vapor bubbles, a better

Single-Phase Heat Transfer and Pressure Drop Characteristics of an Integral-Spine Fin Within an Annulus

June 1, 1994

Author(s)

Mark A. Kedzierski, M S. Kim

Horizontal Nucleate Flow Boiling Heat Transfer Coefficient Measurements and Visual Observations for R12, R134a, and R134a/Ester Lubricant Mixtures

May 9, 1993

Author(s)

Mark A. Kedzierski, M P. Kaul

The heat transfer characteristics of horizontal nucleate flow boiling of R12, R134a, and R134a/Ester Lubricant mixtures were investigated both visually and calorimetrically.

Horizontal Nucleate Flow boiling Heat Transfer Coefficient Measurements and Visual Observations for R12, R134a, and R134a/Ester Lubricant Mixtures (NISTIR 5144)

March 1, 1993

Author(s)

Mark A. Kedzierski, M P. Kaul

The heat transfer characteristics of horizontal nucleate flow boiling of R12, R134a, and R134a/Ester Lubricant mixtures were investigated both visually and calorimetrically.

Horizontal Flow Boiling of Single Component and Binary Refrigerant Mixtures (ER-8006-2)

January 1, 1993

Author(s)

Mark A. Kedzierski, David Didion

This report contains three studies on refrigerant mixture heat transfer funded by NIST and EPRI (RP 80006-21). The first study, Visualization of Nucleate Flow for an R22/R114 Mixture and Its Components, is presented in section 1. It investigates the