Influence of concentration and additives on R123/paraffinic material oil boiling heat transfer performance / Mark A. Kedzierski, D.H. Han.

Format:

Book

Government document

Author/Creator:

Kedzierski, Mark A., author.

Contributor:

Han, D. H.

Building and Fire Research Laboratory (U.S.)

Series:

NISTIR ; 7336.

NISTIR ; 7336

Language:

English

Subjects (All):

Heat--Transmission.

Heat.

Lubrication and lubricants.

Physical Description:

1 online resource (42 pages) : illustrations.

Place of Publication:

[Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology, [2006].

System Details:

text file

Summary:

This report investigates the effect that oil concentration had on the boiling performance of an R123/paraffinic mineral oil mixture on a roughened, horizontal flat surface. For all compositions (0.5 %, 1 %, and 2 %), the lubricant caused a heat transfer degradation relative to the heat transfer of pure R123 of between 2 % and 70 % for the range of measured heat fluxes. The heat transfer degradation was shown to increase with lubricant mass fraction. The minimum heat transfer degradation for each mixture ranged between 2 % and 12 % and occurred at approximately 20 kW/m2. For a given composition, the heat transfer degradation increased as the heat flux increased from roughly 20 kW/m2 to 90 kW/m2. In addition, the effect of two trial additives on the pool boiling heat transfer of an R123/paraffinic mineral oil mixture was examined in order to test the validity of a theory for choosing oil additives to enhance boiling performance. The verification tests were inconclusive. More research with lubricants and additives with greater differences in surface tensions is required to develop a more rigorous and quantifiable theory for designing additives that improve boiling heat transfer.

Notes:

"September 2006."

Contributed record: Metadata reviewed, not verified. Some fields updated by batch processes.

Title from page [1], viewed March 5, 2007.

Includes bibliographical references (page 12).

OCLC:

86119043

Publisher Number:

GOVPUB-C13-489b90561284b9ea95651b896d6f68ac

Access Restriction:

Open Access Unrestricted online access