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The Effect of Heat Transfer Coefficient on Ice Layer Thickness on Water Surface (Communication)

Oleśkowicz Popiel Czesław, Wojtkowiak Janusz

Ciepłownictwo, Ogrzewnictwo, Wentylacja

2019

T. 50, nr 10

384--385

In this communication it is proved that estimating time of formation of the ice layer on water the convective and radiation heat transfer between surrounding air and surface of ice cannot be ignored.

W komunikacie wykazano, że do określenia czasu formowania się określonej grubości warstwy lodu na powierzchni wody niezbędna jest znajomość konwekcyjnego i radiacyjnego współczynnika przejmowania ciepła pomiędzy otaczającym powietrzem i powierzchnią warstwy lodu.

The calculation of received optical power during airborne laser scanning of water object

Babushka A., Burshtynska K., Babiy L.

Geomatics, Landmanagement and Landscape

2014

no. 3

7--15

In this paper calculation of some physical parameters of the receiver of laser scanning system is presented. Basic physical principles of laser scanning of water objects are considered. Ranging standard deviation for typical parameters of laser scanning system are calculated. Formula for calculation of reflected optical power for specular reflective objects is proposed.

Impact of raw water quality on operation of variable declining rate filter plants

Zielina M., Dąbrowski W.

Environment Protection Engineering

2011

Vol. 37, nr 2

133-140

According to some numerical models of variable declining rate filters in a bank changes in raw water quality do not interfere with values of flow rates through filters as long as subsequent backwashes in a plant start always for the same water surface level above filter media. This simple operational rule was previously tested numerically. Now some results of experimental tests are also presented. Laboratory experiments confirm the operational rule predicted theoretically and supported by numerical computations.