BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI

More documents

Recommendations

Info

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.
Page 1:
BULETINUL INSTITUTULUI POLITEHNIC D
Page 5:
Page 8 and 9:
PETRU CÂRLESCU, VASILE DOBRE, IOAN
Page 10 and 11:
2 Niooleta Negoescu continue telle
Page 12 and 13:
4 Niooleta Negoescu min{ μ( Tu , T
Page 14 and 15:
6 Niooleta Negoescu Observation 8.
Page 16 and 17:
8 Ion Crăciun with large molecules
Page 18 and 19:
10 Ion Crăciun ∂ ∂ ∂ ∂ ∇
Page 20 and 21:
12 Ion Crăciun ⎧σ ji = ( μ+ α
Page 22 and 23:
14 Ion Crăciun If we introduce the
Page 24 and 25:
16 Ion Crăciun where the scalar La
Page 26 and 27:
18 Ion Crăciun and 0 0 0 2 2 ⎧
Page 28 and 29:
20 Ion Crăciun Ψ r Having assumed
Page 30 and 31:
22 Ion Crăciun Ignaczak, J., Tenso
Page 33 and 34:
Page 35 and 36:
Bul. Inst. Polit. Iaşi, t. LVIII (
Page 37 and 38:
Page 39 and 40:
Page 41: Bul. Inst. Polit. Iaşi, t. LVIII (
Page 44 and 45: 36 Radu Ibănescu and Cătălin Ung
Page 52 and 53: 44 Petronela Paraschiv case of biom
Page 54 and 55: 46 Petronela Paraschiv calculation
Page 56 and 57: 48 Petronela Paraschiv interpolate
Page 59 and 60: BULETINUL INSTITUTULUI POLITEHNIC D
Page 61 and 62: Bul. Inst. Polit. Iaşi, t. LVIII (
Page 88 and 89: 80 Gelu Coman and Valeriu Damian ma
Page 90 and 91: 82 Gelu Coman and Valeriu Damian h
Page 94 and 95: 86 Gelu Coman and Valeriu Damian iv
Page 96 and 97: 88 Florin Popa et al. In this figur
Page 98 and 99: 90 Florin Popa et al. the notations
Page 100 and 101: 92 Florin Popa et al. Δ = 0 and C
Page 114 and 115: 106 Vlad Marţian et al there is al
Page 116 and 117: 108 Vlad Marţian et al that all th
Page 118 and 119: 110 Vlad Marţian et al The battery
Page 120 and 121: 112 Vlad Marţian et al Current Int
Page 122 and 123: 114 Vlad Marţian et al Another fac
Page 124 and 125: 116 Vlad Marţian et al În concluz
Page 126 and 127: 118 Petru Cârlescu et al indicate
Page 128 and 129: 120 Petru Cârlescu et al hs p dT d
Page 130 and 131: 122 Petru Cârlescu et al air malt
Page 132 and 133: 124 Petru Cârlescu et al a b Fig.
Page 134: 126 Petru Cârlescu et al Iguaz A.,
show all

BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI

Create successful ePaper yourself

Delete template?

Save as template?