Transient natural convection inside rigid drops in a liquid-liquid direct-contact heat exchanger

Miscellaneous · Fri Jan 01 00:00:00 EST 1988

OSTI ID:7070243

Hutchins, J F

Natural convection was simulated inside spherical container and drops. The transient Navier-Stokes and energy equations were solved by employing finite-difference techniques. Pseudosteady-state natural convection inside spheres was simulated. Pseudosteady state was maintained by keeping the driving force for natural convection constant. To obtain pseudosteady state conditions, the temperature at the inside surface of the sphere was steadily increased so that the temperature difference between the surface and the center remained constant. The results were compared to experimental data found in the literature. It was found that the Nusselt number (Pr > 0.7) for pseudosteady state correlated to the Raleigh number by the following relation: Nu = 1.19Ra{sup .2215}, 10{sup 5} < Ra < 10{sup 8}. The simulation results were compared to experimental data of two other researchers who measured drop-temperature profiles in direct-contact heat-exchange columns. The simulation results demonstrate good correlation to the experimental data.

• Research Organization: California Univ., Santa Barbara, CA (USA)
• OSTI ID: 7070243
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CONTAINERS
NATURAL CONVECTION
ENERGY TRANSFER
FINITE DIFFERENCE METHOD
SIMULATION
NAVIER-STOKES EQUATIONS
NUSSELT NUMBER
SPHERICAL CONFIGURATION
CONFIGURATION
CONVECTION
DIFFERENTIAL EQUATIONS
EQUATIONS
HEAT TRANSFER
ITERATIVE METHODS
MASS TRANSFER
NUMERICAL SOLUTION
PARTIAL DIFFERENTIAL EQUATIONS
420400* - Engineering- Heat Transfer &amp; Fluid Flow