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contributor authorTan, Jen Hong
contributor authorNg, E. Y. K.
contributor authorAcharya, U. Rajendra
date accessioned2017-05-09T00:59:45Z
date available2017-05-09T00:59:45Z
date issued2013
identifier issn0022-1481
identifier otherht_135_5_054505.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/152125
description abstractThe thermodynamic effect of tear film on ocular surface remains ambiguous in literature, though in general it is considered to warm the surface in blinking phase, and cool it at later stage. In this investigation, we modeled the temporal variation in ocular surface temperature (OST) on the basis of Newton's law of cooling to look into the tear film's thermodynamic effect. We assumed, the OST varied periodically and the OST just before a blink was equal to the OST observed when the surface was in equilibrium. Then, this model was incorporated into a thermodynamic equation, describing the heat exchange at the ocular surface. Simulations were subsequently performed to determine the moment when the tear film evaporated the exactly amount of energy it had just brought to the surface by blinking in an interblink period. It was found that, for tear film to possibly warm the ocular surface both in the blinking phase and the entire interblink period, its thickness had to be above 32 خ¼m, assuming the rate of spontaneous blinking was once per 6 s. However, according to literature, tear film thickness is likely to be 3 خ¼m, which in this case, the tear film would evaporate the teartransferred heat just within a second, and the warming effect by tear film would be minimal; cooling should be the dominating effect.
publisherThe American Society of Mechanical Engineers (ASME)
titleThe Effect of Tear Film on Ocular Surface Temperature: A Thermodynamic Study
typeJournal Paper
journal volume135
journal issue5
journal titleJournal of Heat Transfer
identifier doi10.1115/1.4023543
journal fristpage54505
journal lastpage54505
identifier eissn1528-8943
treeJournal of Heat Transfer:;2013:;volume( 135 ):;issue: 005
contenttypeFulltext


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