A Review of Laminar Single-Phase Flow in Microchannels

2001 ◽  
Author(s):  
Ian Papautsky ◽  
Tim Ameel ◽  
A. Bruno Frazier
Keyword(s):  
Fluid Flow ◽  
Single Phase ◽  
Experimental Investigations ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Research Activities ◽  
Internal Fluid ◽  
Internal Fluid Flow ◽  
Microscale Flows ◽  
New Applications

Abstract Microfluidics plays a major role in the development of many innovative research activities aimed at the development of miniaturized devices and systems, and new applications related to microscale handling of fluids. As the field of microfluidics continues to grow, it is becoming increasingly important to understand the mechanisms and fundamental differences involved in microscale fluid flow. This paper presents a summary of the experimental research efforts in the area of microscale single-phase internal fluid flow and discusses issues associated with investigating microscale flows. While the currently available experimental data indicate the presence of microscale phenomena, they do not unequivocally identify the effects. There is a clear need for additional experimental investigations.

Performance Evaluation of Liquid Flow With PCM Particles in Microchannels

2005 ◽  
Vol 127 (8) ◽  
pp. 931-940 ◽  
Author(s):  
K. Q. Xing ◽  
Y.-X. Tao ◽  
Y. L. Hao
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Laminar Flow ◽  
Phase Change ◽  
Performance Index ◽  
Single Phase ◽  
Suspension Flow ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Two Phase

A two-phase, non thermal equilibrium-based model is applied to the numerical simulation of laminar flow and heat transfer characteristics of suspension with microsize phase-change material (PCM) particles in a microchannel. The model solves the conservation of mass, momentum, and thermal energy equations for liquid and particle phases separately. The study focuses on the parametric study of optimal conditions where heat transfer is enhanced with an increase in fluid power necessary for pumping the two-phase flow. The main contribution of PCM particles to the enhancement of heat transfer in a microsize tube is to increase the effective thermal capacity and utilize the latent heat effect under the laminar flow condition. An effectiveness factor εeff is defined to evaluate the heat transfer enhancement compared to the single-phase flow heat transfer and is calculated under different wall heat fluxes and different Reynolds numbers. The comparison is also made to evaluate the performance index, i.e., the ratio of total heat transfer rate to fluid flow power (pressure drop multiplied by volume flow rate) between PCM suspension flow and pure water single-phase flow. The results show that for a given Reynolds number, there exists an optimal heat flux under which the εeff value is the greatest. In general, the PCM suspension flow with phase change has a significantly higher performance index than the pure-fluid flow. The comparison of the model simulation with the limited experimental results for a MCPCM suspension flow in a 3mmdia tube reveals the sensitivity of wall temperature distribution to the PCM supply temperature and the importance of characterizing the phase change region for a given tube length.

Performance Evaluation of Liquid Flow With NPCM in Microchannels

Volume 4 ◽  
2004 ◽  
Author(s):  
K. Q. Xing ◽  
Y.-X. Tao ◽  
Y. L. Hao
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Laminar Flow ◽  
Phase Change ◽  
Performance Index ◽  
Single Phase ◽  
Suspension Flow ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Two Phase

A two-phase, non-thermal-equilibrium based model is applied to the numerical simulation of laminar flow and heat-transfer characteristics of suspension with nano-size phase change material (NPCM) particles in a microchannel. The model solves the conservation of mass, momentum and thermal energy equations for liquid and particle phases separately. The study focuses on the parametric study of optimal conditions where heat transfer is enhanced with an increase in fluid power necessary for pumping the two-phase flow. The main contribution of NPCM particles to the enhancement of heat transfer in a micro-size tube is to increase the effective thermal capacity and utilize the latent heat effect under the laminar flow condition. An effectiveness factor εeff is defined to evaluate the heat transfer enhancement compared to the single phase flow heat transfer and is calculated under different wall heat fluxes and different Reynolds numbers. The comparison is also made to evaluate the performance index (PI); i.e., the ratio of total heat transfer rate to fluid flow power (pressure drop multiplied by volume flow rate) between NPCM suspension flow and pure water single-phase flow. The results show that for a given Reynolds number, there exists an optimal heat flux under which the εeff value is the greatest. In general, the NPCM suspension flow with phase change has a significantly higher performance index than the pure-fluid flow.

Critical review on wax deposition in single-phase flow

Fuel ◽  
2021 ◽  
Vol 293 ◽  
pp. 120358
Author(s):  
Charlie van der Geest ◽  
Aline Melchuna ◽  
Letícia Bizarre ◽  
Antonio C. Bannwart ◽  
Vanessa C.B. Guersoni
Keyword(s):  
Critical Review ◽  
Single Phase ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Wax Deposition
Sign in / Sign up

Export Citation Format

Share Document