BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI

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84 Gelu Coman and Valeriu Damian Thus, for the X and –Y directions we have a swift temperature decrease, and on Y direction a slower decrease due to the water surface convective heat flow. Fig. 4 – Temperature distribution at τ = 30min for the water immersed pipe. Fig. 5 – Temperature distribution at τ = 150 min for the water immersed pipe. Figs. 6 and 7 show images of temperature distribution for the sand embedded pipe for some moments in time.In comparison to the water immersed pipes, it can be noticed a steeper temperature decrease on the domain surfaces and a more uniform distribution on the air-water contact surface. Fig. 6 – Temperature distribution at τ = 150 min for the sand embedded pipe. Fig. 7 shows temperature variation on the three envisaged contours at some time moments. It can be noticed a different a temperature distribution on contour surfaces depending on their position within the analyzed domain.
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 3, 2012 85 Fig.7–Temperature distribution at τ=150min for the sand embedded pipe. Fig. 8 – Temperature variation on the three envisaged contours at τ = 180 min. 4. Conclusions 1. Compared with the submerged pipes, there is a much faster decrease of surface temperature and a more uniform distribution at air-water contact.At the end of the process minimum temperatures on the surfaces studied took the following values: temperature of the inner surface of pipe t=-8.4 0 C, temperature on the bottom board surface of the track t=- 8.32 0 C, temperature on sand-water contact surface t= 5.15 0 C, ice surface temperature t=-4.62 0 C. 2. From the data analyzed it follows that in terms of heat transfer and ice quality, the sand buried pipe design is recommended due to the following aspects: i) Complete water solidification time over the range concerned is reduced. ii) Water surface temperature distribution is uniform resulting in a high quality ice. iii) Solidification front is spreading quickly and evenly.
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BULETINUL INSTITUTULUI POLITEHNIC D
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BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI

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