Prediction of in-tube boiling of mixtures in vertical thermosyphon reboilers

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6509430

Thome, J R

The present study investigates the mixture effect on the nucleate boiling contribution to convective boiling inside of vertical tubes at low vapor qualities. The effect of mass diffusion on the boiling process is seen to reduce the nucleate boiling heat transfer coefficient for mixtures substantially relative to an equivalent pure fluid with no mixture effect. Thus, there is a strong variation in the heat transfer coefficient with composition. Mixture boiling correction factors from two published convective boiling mixture correlations are tested against a published set of experimental data for the convective boiling of ethanol/cyclohexane mixtures with partial success. Several correlations for the mixture correction factor in nucleate pool boiling are shown to accurately predict the data's variation with composition and heat flux. One of these correlations is presented for the first time here and uses the boiling range with a heat flux dependency to model the mixture boiling process.

• Research Organization: Dept. of Mechanical Engineering, Michigan State Univ., East Lansing, MI 48824
• OSTI ID: 6509430
• Report Number(s): CONF-861146-
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALCOHOLS
ALKANES
BOILERS
BOILING
CHEMICAL COMPOSITION
CYCLOALKANES
CYCLOHEXANE
DISPERSIONS
ENERGY TRANSFER
ETHANOL
HEAT TRANSFER
HYDROCARBONS
HYDROXY COMPOUNDS
MATHEMATICAL MODELS
MIXTURES
NUCLEATE BOILING
ORGANIC COMPOUNDS
ORIENTATION
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
THERMOSYPHONS
TUBES