Supercooling of pure water and selected food products contained in 211x300" can size

Date

6-2016

Degree

Bachelor of Science in Food Technology

Major Course

Major in Food Science

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Ernesto V. Carpio

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

Selected food products, specifically whole milk, ketchup, and pure water, were supercooled in cans of size 211x300. Five thermocouples were placed in different positions along the plane at the geometric center of the can, varying from nearest to the inside walls of the can to the center. Two more thermocouples were used to monitor the freezer and ADC temperature. Results were recorded via ADC-1 A2 Feedback P2 Control. Data points were plotted per can trial. A total of seven graphs are presented in a chart, in which five of those are the overlapping freezing curves of the sample. The location where nucleation first takes place, or where the supercooling stops was observed. Results showed that in a can of size 211x300?, supercooling of whole milk and pure water can be observed, but not for ketchup. This can be attributed to the high total soluble solids of ketchup. Also, some trials showed that freezing does not necessarily take place in the part of the system closest to the freezer. Some trials exhibited the first nucleation at the center, or near the center. Moreover, a peculiar phenomenon in most of the water trials was documented. During the initial decrease in temperature of water, a short plateau in temperature was seen at around 5.5°C until about 2.5°C. This was justified to be one of the anomalies of water related to thermal expansion, and therefore, its density. Lastly, it was observed that the time of the supercooling of pure water and whole milk were relatively short before it started to freeze.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2016 F61 /P34

Document Type

Thesis

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