High viscous liquids as a source in micro-screw heat exchanger: fabrication, simulation and experiments

El-Sadi, Haifa; Esmail, Nabil; Athienitis, Andreas

doi:10.1007/s00542-006-0366-x

Cited by 1 publication

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References 11 publications

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“…The agreement with the numerical and experimental predictions of Nusselt number and pressure drop values were well within 6.3% for Nusselt number and 9.8% for pressure drop in the shell side, respectively. Haifa El-Sadi et al [4] presented experimental and numerical simulation of a micro screw heat exchanger to determine the overall heat transfer coefficient. M.R.H.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Double-Pipe Heat Exchanger With Helical Fins on the Inner Rotating Tube

.¹

2014

IJRET

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Heat exchanger is an important device in all the thermal systems. The heat exchanger is widely used equipment in different industries such as process, petroleum refining, chemicals and paper etc. Energy and material saving considerations as well as environmental challenges in the industry have stimulated the demand for high efficiency heat exchanger. To improve the efficiency of heat exchanger one must think of heat transfer enhancement in heat exchanger. Moreover heat transfer enhancement enables the size of heat exchanger to be considerably decreased. A high rate of heat transfer with minimum space requirement is necessity for compact heat exchanger. In present work, to improve the heat transfer characteristic of the double pipe heat exchanger, the helical fins were installed on the outer surface of the inner tube and the level of turbulence increased by the rotating the inner tube. The length of heat exchanger was 1m and the pitch of helical fins kept constant equal to 17 mm. The convective heat transfer coefficients were obtained for the stationary as well as rotating inner tube for the counter flow mode using water as cold fluid in the tube side and glycerol as hot fluid in the shell side. The flow rate of cold fluid was kept constant and that of hot fluid was varied. The Nusselt number was calculated for the each speed of the rotation and compared with standard values obtained from Dittus-Boelter equation. The helical fins increases heat transfer area and rotation of the inner tube increases the mixing of fluid particles which is necessary for the convection mode of heat transfer. The Nusselt number increased up to 64 % at 100 rpm compared to stationary inner tube with helical fins.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Double-Pipe Heat Exchanger With Helical Fins on the Inner Rotating Tube

.¹

2014

IJRET

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show abstract

High viscous liquids as a source in micro-screw heat exchanger: fabrication, simulation and experiments

Abstract: Viscous liquids can be encountered in many applications of micro devices.

Cited by 1 publication

References 11 publications

Experimental Investigation of Double-Pipe Heat Exchanger With Helical Fins on the Inner Rotating Tube

Experimental Investigation of Double-Pipe Heat Exchanger With Helical Fins on the Inner Rotating Tube

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