Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

ELECTROHYDRODYNAMIC AUGMENTATION OF DIRECT-CONTACT HEAT TRANSFER TO DROPS PASSING THROUGH AN IMMISCIBLE DIELECTRIC LIQUID: EFFECT OF FIELD-INDUCED SHUTTLE MIGRATION BETWEEN PARALLEL PLANE ELECTRODES OF DROPS

Get access (open in a dialog) DOI: 10.1615/IHTC7.4450
pages 231-236

Abstrakt

This paper presents an experimental examination of electrohydrodynamic augmentation of heat transfer to single water drops of 4 to 6 mm diameter rising in methylphenyl silicone oil bounded by vertically-installed parallel-plate electrodes across which a steady d.c. field is to be applied. In case of drops rising almost rectilinearly, augmentation up to 40 % is obtained principally due to the field-induced circulations inside and outside drops. A drop once brought into contact with an electrode begins to bounce back and forth between the electrodes, provided the field strength falls in a specific limited range prescribed by the electrode spacing. Such a "shuttle migration" of drops yields a much stronger augmentation resulting in an increase of heat transfer rate up to three times for drops of ~ 5 mm diameter and probably a much higher increase for smaller drops. The electric power loss is estimated to be enough small to ensure the economic feasibility of this novel augmentation method.