Experimental investigation of forced convective heat transfer coefficient in nanofluids of Al2O3/EG and CuO/EG in a double pipe and plate heat exchangers under turbulent flow

2011 ◽  
Vol 35 (3) ◽  
pp. 495-502 ◽  
Author(s):  
Amirhossein Zamzamian ◽  
Shahin Nasseri Oskouie ◽  
Ahmad Doosthoseini ◽  
Aliakbar Joneidi ◽  
Mohammad Pazouki
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Convective Heat Transfer ◽  
Heat Exchangers ◽  
Convective Heat Transfer Coefficient ◽  
Plate Heat ◽  
Forced Convective Heat Transfer ◽  
Double Pipe

scholarly journals Test of the Layout of the Correction Circuit With a Plate Heat Exchanger

2021 ◽  
Vol 7 (1) ◽  
pp. 279-287
Author(s):  
Z. Guo ◽  
J. Shan ◽  
J. Li ◽  
A. Levtsev
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Heat Exchanger ◽  
Heat Flow ◽  
Transfer Coefficient ◽  
Convective Heat Transfer ◽  
Convective Heat Transfer Coefficient ◽  
Plate Heat Exchanger ◽  
Enhanced Heat Transfer ◽  
Plate Heat

Pulse enhanced heat transfer technology is introduced, and a plate heat exchanger is designed. A pulsating valve is installed at the outlet of the heat exchanger to pulsate the heat medium. Pulsating and non-pulsating heat transfer tests are carried out on the same heat exchanger. On the basis of experiments, the effective temperature difference, heat flow and convective heat transfer coefficient of the heat exchanger at different pulse frequencies are analyzed by combining the theory of pulse enhanced heat transfer technology, heat transfer capacity, heat flow and convective heat transfer coefficient. Find the relationship between pulsation frequency of heat transfer effect of heat exchanger. The experimental results show that the heat exchanger has high heat transfer efficiency under the experimental conditions when there is pulsation.

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.

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