Direct contact heat transfer between coconut oil and water using multi-nozzle dispersal system: Project study

• Main Authors: Chua, Welfred, Co, Hong Yap, Pua, Tony, Sze, Fook Hing
• Format: text
• Language: English
• Published: Animo Repository 1986
• Subjects: Heat transmission; Coconut oil; Water; Nozzles; Chemical Engineering
• Online Access: https://animorepository.dlsu.edu.ph/etd_honors/24
• Institution: De La Salle University

Direct heat transfer in an exchange column, 8.9 cm. ID and 122 cm. height, was studied. The system used was refined coconut oil and water, with the oil phase dispersed. The dispersed phase rate was varied from 1.56 to 15.77 ml. /sec., and the water phase rate covered the range 4.22 to 23.75 ml./sec.. Observations were made on three different sizes of nozzles, namely: 1/8 inch, ¼ inch, and 5/16 inch. The results of the study show that the drop diameter of oil droplets is a function of nozzle velocity. When nozzle velocity increases, the drop size decreases. The drop velocity is also a function of drop diameter, where larger drop size causes a higher drop velocity. The overall heat transfer coefficient decreases as holdup increases due the partial obstruction of interfacial area by closely packed droplets. Water phase film coefficient was found to be affected by holdups. At low holdups, the film coefficient is less than the overall heat transfer coefficient. At high holdups, the reverse is true.