scholarly journals Experimental investigation of fluid flow and heat transfer in a single-phase liquid flow micro-heat exchanger

2009 ◽  
Vol 52 (23-24) ◽  
pp. 5433-5446 ◽  
Author(s):  
N. García-Hernando ◽  
A. Acosta-Iborra ◽  
U. Ruiz-Rivas ◽  
M. Izquierdo
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Fluid Flow ◽  
Heat Exchanger ◽  
Liquid Flow ◽  
Single Phase ◽  
Flow And Heat Transfer ◽  
Micro Heat Exchanger ◽  
Phase Liquid ◽  
Single Phase Liquid Flow

A Review of Single-Phase Liquid Flow and Heat Transfer in Microchannels

2004 ◽  
Author(s):  
Peiqing Shen ◽  
Shahrouz K. Aliabadi ◽  
Jalal Abedi
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Single Phase ◽  
Research Area ◽  
Theoretical Explanation ◽  
Conventional Theory ◽  
Flow And Heat Transfer ◽  
Important Research Area ◽  
Phase Liquid ◽  
Liquid Flows

Fluid flow and heat transfer in microchannels have been important research area during the past decade. The understanding and explanation of the fundamental mechanisms of flow and heat transfer are critical to the application of microchannel systems to many important industrial and research projects. We present a review of the literatures on fluid flow and heat transfer of single-phase liquid in microchannels. Recent experimental and theoretical studies are both covered. The emphasis has been on studies on single-phase liquid flows. As a conclusion, although further work needs to be done, carefully designed experiments have obtained data that agree well with the conventional theory developed for larger channels. The theoretical explanation of some experimental results, which deviate the conventional theory for larger channels, is still under development.

Friction Losses and Heat Transfer in Laminar Microchannel Single-Phase Liquid Flow

2008 ◽  
Author(s):  
Vaˆnia Silve´rio ◽  
Anto´nio L. N. Moreira
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Liquid Flow ◽  
Single Phase ◽  
Wall Heat Flux ◽  
Oxide Thin Film ◽  
Flow Conditions ◽  
Constant Wall Heat Flux ◽  
Phase Liquid ◽  
Single Phase Liquid Flow

Many studies addressed the validity of macroscale theories to describe momentum and heat transfer in single phase in microtubes, but the results are often inconsistent. It is suggested that the fluid flow and heat transfer in microchannels without phase change is substantially different from that in larger channels. However, these discrepancies may be attributed to experimental uncertainties mainly due to the use of conventional measurement apparatus that are too big to implement in the tested system. Other researchers explain the microfluidic behavior with the ratio of surface forces to body forces which evolve inversely to the hydraulic diameter. The present work considers the use of a dedicated experimental facility built to allow the use of optical diagnostic and flow visualization techniques in heated microtubes and addresses the potential microscale effects which may arise for single phase flow conditions. The experiments encompass measurements of the pressure drop and the longitudinal temperature distribution in the fully developed single phase liquid flow established in circular and square cross section of channels made of borosilicate glass with hydraulic diameters from 50μm up to 500μm. The flow conditions consider a range of Reynolds number from 10 up to around 2500 and the use of diverse fluids to account for the effects of liquid properties. Namely, three distinct fluids were used: distilled water, methoxy-nonafluorobutane and methanol. For heat transfer studies, the channels are heated with constant wall heat flux supplied by Joule effect by means of external wall rf-PERTE deposition of Indium Oxide thin film. The thin transparent film showed good chemical stability in the range of temperatures up to 70°C, therefore indicating that the thermal boundary condition approximates a constant wall heat flux condition. The mass flux is varied from 60 to 3300kg.m−2·s−1 and the heat flux was set between 4 and 6kW.m−2. Experimental uncertainties are estimated to be below 14% for the friction factor and below 24% for Nusselt number; the former is dominated by inaccuracies in the diameter, while the second is dominated by temperature measurements.

Pressure Drop and Heat Transfer of Magnetohydrodynamic Annular Two-Phase Flow in Rectangular Channel

1998 ◽  
Vol 120 (1) ◽  
pp. 152-159 ◽  
Author(s):  
H. Kumamaru ◽  
Y. Fujiwara
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Liquid Flow ◽  
Single Phase ◽  
Two Phase Flow ◽  
Rectangular Channel ◽  
Phase Flow ◽  
Two Phase ◽  
Phase Liquid ◽  
Single Phase Liquid Flow

An annular two-phase flow model has been proposed to predict the pressure drop and heat transfer of magnetohydrodynamic (MHD) gas-liquid metal two-phase flow in a rectangular channel for the case of high void fraction. The model for a rectangular channel, in which the applied magnetic field is perpendicular to the short side of the channel cross-section, nearly predicts Inoue et al.’s experimental data on the MHD pressure drop. For fusion reactor conditions, the model shows calculated results that the MHD pressure drop for two-phase flow can be lowered to 10 percent of that of the single-phase liquid flow and the heat transfer coefficient can be increased by a factor of two or more over that of the single-phase liquid flow.

Review and Fabrication of Nanochannels for Single Phase Liquid Flow

2005 ◽  
Author(s):  
Jeffrey L. Perry ◽  
Satish G. Kandlikar
Keyword(s):  
Heat Transfer ◽  
Fluid Mechanics ◽  
Liquid Flow ◽  
Single Phase ◽  
Micro Fabrication ◽  
Probable Reason ◽  
Micron Size ◽  
Phase Liquid ◽  
Single Phase Liquid Flow

The topic of single phase liquid flow in submicron or nanochannels is a nascent field. There have only been a couple papers that have dealt with this area directly. The most probable reason for this is that currently most research in fluid mechanics or heat transfer is being focused on micron size channels. To help facilitate researchers to focus on this undeveloped area, this paper serves as a review for some of the micro-fabrication processes that will make it possible for engineers and scientists to study this field in greater detail.

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