Experimental Investigation of Convective Heat Transfer Using Graphene Nanoplatelet Based Nanofluids under Turbulent Flow Conditions

2014 ◽  
Vol 53 (31) ◽  
pp. 12455-12465 ◽  
Author(s):  
Emad Sadeghinezhad ◽  
Mohammad Mehrali ◽  
Sara Tahan Latibari ◽  
Mehdi Mehrali ◽  
S. N. Kazi ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Turbulent Flow ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Flow Conditions ◽  
Graphene Nanoplatelet ◽  
Turbulent Flow Conditions

Heat Transfer Coefficient in Helical Heat Exchangers under Turbulent Flow Conditions

2008 ◽  
Vol 4 (1) ◽  
Author(s):  
Pablo Coronel ◽  
K.P. Sandeep
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Heat Exchangers ◽  
Convective Heat Transfer Coefficient ◽  
Flow Conditions ◽  
Overall Heat Transfer Coefficient ◽  
Turbulent Flow Conditions

This study involved the determination of convective heat transfer coefficient in both helical and straight tubular heat exchangers under turbulent flow conditions. The experiments were conducted in helical heat exchangers, with coils of two different curvature ratios (d/D = 0.114 and 0.078), and in straight tubular heat exchangers at various flow rates (1.89 x 10-4 - 6.31 x 10-4 m3/s) and for different end-point temperatures (92 - 149 °C). The results show that the overall heat transfer coefficient (U) in the helical heat exchanger is much higher than that in straight tubular heat exchangers. In addition, U was found to be larger in the coil of larger curvature ratio (d/D = 0.114) than in the coil of smaller curvature ratio (d/D = 0.078). The inside (hi) and outside (ho) convective heat transfer coefficients were determined based on the overall heat transfer coefficient and a correlation to compute the inside convective heat transfer coefficient (hi) as a function of NRe, NPr, and d/D was developed.

Experimental investigation of convective heat transfer for night ventilation in case of mixing ventilation

2021 ◽  
Vol 193 ◽  
pp. 107670
Author(s):  
Rui Guo ◽  
Per Heiselberg ◽  
Yue Hu ◽  
Hicham Johra ◽  
Rasmus Lund Jensen ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Night Ventilation
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