Evaporation control using a monomolecular organic surface film | |
| Author | Rehman, Abdul |
| Call Number | AIT SSPR no. WA-82-04 |
| Subject(s) | Monomolecular films Evaporation control |
| Note | A special study submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | The purpose of this study was to demonstrate the application of a monomolecular surface film for evaporation reduction under the climatic conditions of Thailand. The study was conducted during the dry part of 1981/82 at AIT campus, Bangkok, Thaila nd. For this, 2 Class-A pans were used , one was treated with a monolayer forming chemical compound and the other served as control. Similarly, 2 evaporation tanks, each with a surface area of 2Sm2 and 1.1 Om deep, were constructed with cement blocks and lined with cement plaster. During the pre-test, the highest maximum a nd the lowest minimum water temperatures of the Class-A pan and the evaporation tank, for the preparation of the chemical, were estimated according to the expected climatic conditions during the main test period. During the calibration period, the seepage losses from each tank were estimated . During the main test, Adol63, an evaporation retardant, solidified at room temperature, containing 30% cetylalcohol and 65% stearylalcohol with tetrahydrofurfuryl alcohol at10% concentration as a dispersant for Adol63, was applied to one of the pans and tanks. An oleylalcohol indicator oil was used to determine the presence of a monolayer film on the water surface. During 28 days of treatment, the maximum areal coverage by the film was estimated as 12% from the tank and there was no presence of the film on the water surface in the Class-A pan. The total evaporation savings from the tank were calculated as 4.1% and no evaporation reduction was found in the Class- A pan. It was concluded that the chemical was not effective as an evaporation retardant. |
| Year | 1982 |
| Type | Special Study Project Report (SSPR) |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Resources Research Engineering (WA) |
| Chairperson(s) | Christoph, Ing. Fried |
| Examination Committee(s) | Suphat Vongvisessomjai ; Gupta, Ashim Das |
| Scholarship Donor(s) | Government of Australia |
| Degree | Special Studies Project Report (M. Eng.) - Asian Institute of Technology, 1982 |