TITLE: Heat Transfer Investigations in a Slurry Bubble Coulmn: Quarterly Report of the Period January--March 1988.

AUTHOR: S. C. Saxena.

INST.  AUTHOR: Illinois Univ. at Chicago Circle. Dept. of Chemical Engineering.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  1988,  29p.

NTIS ORDER NO.: DE88015481/INW

ABSTRACT:

The small 10.8 cm diameter Plexiglas slurry bubble column has been operated in various modes and in different evironment. It has been used to measure heat transfer coefficient between a heat transfer probe of 19 mm diameter place coaxially and air-water dispersion as a function of air velocity. The effect of water flow velocity, position of heat-transfer section and heat flux value on heat-transfer coefficient has been studied and discussed. The uncertainty in the measurements have been determined.  To study the heat trasfer mechanism, experiments were conducted to measure fluctuating heat-transfer coefficient at a sampling rate of 10 readings per minute. The experiments were also conducted to measure the local temperature on heat transfer surface at a high sampling rate of 20 readings per second. The design, fabrication and installation work on the larger 0.305 m diameter column has progressed and it is expected that various flow loops and measuring circuits will be completed shortly. A heat transfer probe of 19 mm diameter is in the advanced stage of fabrication. A special circuit is assembled to energize the electrical heater. Interpretation of our experimental air holdup data for different operating conditions in terms of available correlations are presented. 18 refs., 15 figs., 3 tabs. (ERA citation 13:046469)

REPORT  NUMBER: DOE/PC/90008-T3

CONTRACT  NUMBER: AC22-86PC90008