Superposition of liquid flow rate disturbances in a heat exchanger at low reynolds number

1979 ◽  
Vol 17 (1) ◽  
pp. 19-40 ◽  
Author(s):  
A.R. Cooper ◽  
H.J. Gutierrez R.
Keyword(s):  
Reynolds Number ◽  
Heat Exchanger ◽  
Flow Rate ◽  
Liquid Flow ◽  
Liquid Flow Rate ◽  
Low Reynolds Number ◽  
Low Reynolds

Numerical Simulations of Resonant Heat Transfer Augmentation at Low Reynolds Numbers

2001 ◽  
Author(s):  
Miles Greiner ◽  
Paul F. Fischer ◽  
Henry Tufo
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Natural Frequency ◽  
Flow Rate ◽  
Low Reynolds Number ◽  
Reynolds Numbers ◽  
Spectral Element ◽  
Pumping Power ◽  
Number Systems ◽  
Low Reynolds

Abstract The effect of flow rate modulation on low Reynolds number heat transfer enhancement in a transversely grooved passage was numerically simulated using a two-dimensional spectral element technique. Simulations were performed at subcritical Reynolds numbers of Rem = 133 and 267, with 20% and 40% flow rate oscillations. The net pumping power required to modulate the flow was minimized as the forcing frequency approached the predicted natural frequency. However, mixing and heat transfer levels both increased as the natural frequency was approached. Oscillatory forcing in a grooved passage requires two orders of magnitude less pumping power than flat passage systems for the same heat transfer level. Hydrodynamic resonance appears to be an effective method of increasing heat transfer in low Reynolds number systems where pumping power is at a premium, such as micro heat transfer applications.

scholarly journals A relation between membrane permeability and flow rate at low Reynolds number in circular pipe

2019 ◽  
Vol 582 ◽  
pp. 91-102 ◽  
Author(s):  
Shintaro Takeuchi ◽  
Asahi Tazaki ◽  
Suguru Miyauchi ◽  
Takeo Kajishima
Keyword(s):  
Reynolds Number ◽  
Membrane Permeability ◽  
Flow Rate ◽  
Low Reynolds Number ◽  
Circular Pipe ◽  
Low Reynolds

Heat Transfer in Liquid-Coupled Indirect Heat Exchanger Systems

1975 ◽  
Vol 97 (4) ◽  
pp. 499-503 ◽  
Author(s):  
R. B. Holmberg
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Flow Rate ◽  
Liquid Flow ◽  
Rate Ratio ◽  
Liquid Flow Rate ◽  
Coupled System ◽  
Heat Transfer Area ◽  
Cold Side ◽  
Total Heat Transfer

The theory of liquid-coupled indirect heat exchanger systems has been studied to ascertain optimum criteria with respect to the coupling-liquid flow rate and the distribution of total heat transfer area between the hot-side and cold-side exchanger units in the case of counterflow arrangement. The optimum coupling-liquid capacity rate is derived and given as a function of the over-all capacity rate ratio and the Ntu ratio between the two exchanger units. For this optimum liquid capacity rate together with the proposed over-all number of transfer units, it is shown that the over-all heat transfer effectiveness of the liquid-coupled system can be expressed in the ordinary form for individual exchanger units in true counterflow.

Effect of Propeller Slipstream on Heat-Exchanger Installations at Low Reynolds Number

2003 ◽  
Vol 40 (4) ◽  
pp. 751-758 ◽  
Author(s):  
Ehab A. Elsaadawy ◽  
Colin P. Britcher
Keyword(s):  
Reynolds Number ◽  
Heat Exchanger ◽  
Low Reynolds Number ◽  
Low Reynolds
Sign in / Sign up

Export Citation Format

Share Document