Synthesis of palm based biolubricant in an oscillatory flow reactor (OFR)

Abstract Oscillatory flow reactors (OFRs) superimpose an oscillatory flow to the net movement through a flow reactor. OFRs have been engineered to enable improved mixing, excellent heat- and mass transfer and good plug flow character under a broad range of operating conditions. Such features render these reactors appealing, since they are suitable for reactions that require long residence times, improved mass transfer (such as in biphasic liquid-liquid systems) or to homogeneously suspend solid particles. Various OFR configurations, offering specific features, have been developed over the past two decades, with significant progress still being made. This review outlines the principles and recent advances in OFR technology and overviews the synthetic applications of OFRs for liquid-liquid and solid-liquid biphasic systems.

Download Full-text

Numerical Simulation Study on the Concentration Field in an Oscillatory Flow Reactor with Conic Ring Baffles

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.378.418 ◽

2013 ◽

Vol 378 ◽

pp. 418-423

Author(s):

Gang Liu ◽

Jia Wu ◽

Wei Li

Keyword(s):

Numerical Simulation ◽

Oscillatory Flow ◽

Flow Reactor ◽

Stokes Equations ◽

Three Dimensional ◽

Concentration Field ◽

Navier Stokes ◽

Navier Stokes Equations ◽

Turbulent Diffusion Coefficient ◽

Simulation Results

The three-dimensional construct of concentration field in an oscillatory flow reactor (OFR) containing periodically spaced conic ring baffles was investigated by numerical simulation employing Reynolds-averaged Navier-Stokes equations. The computation covered a range of Oscillatory Reynolds number (Reo) from 623.32 to 3116.58 at Strouhal number (St) 0.995 and 1.99. The contour of concentration field showed that the concentration in the most part of the channel is relative uniform and a small retention area is found below the conic ring baffles, which means a region of relative poor mixing. In addition, the turbulent diffusion coefficient calculated from the simulation results implied the greater oscillatory amplitude and oscillatory frequency superimposed to the fluid, the stronger is the turbulence intensity.

Download Full-text

Analysis of Liquid Flow and Mixing in an Oscillatory Flow Reactor Provided with 2D Smooth Periodic Constrictions

U Porto Journal of Engineering ◽

10.24840/2183-6493_004.002_0001 ◽

2018 ◽

Vol 4 (2) ◽

pp. 1-15 ◽

Cited By ~ 2

Author(s):

F. Almeida ◽

F. Rocha ◽

A. Ferreira

Keyword(s):

Flow Rate ◽

Oscillatory Flow ◽

Flow Reactor ◽

Cross Sectional Area ◽

Axial Dispersion ◽

Mixing Efficiency ◽

Sectional Area ◽

Cross Sectional ◽

Liquid Dispersion ◽

Fluid Oscillation

In this research paper the residence time distribution (RTD) was monitored for a range of fluid oscillation, frequency, amplitude and flow rate in two oscillatory flow reactors (OFR) provided with 2D smooth periodic constrictions (2D-SPC) with different designs. It was studied the axial liquid dispersion using axial dispersion model and the mixing efficiency using tank-in-series model for continuous mode. Two cases, with and without fluid oscillation, were studied and determined the optimum conditions to ensure a close plug flow, an efficient mixing and a low axial liquid dispersion. The optimum operation conditions for the two 2D-SPC designs were found. Moreover, the effect of open cross-sectional area (a) on mixing and axial dispersion was also investigated. For low cross-sectional area values the mixing is higher. It was observed that fluid oscillation increases the mixing intensity even at lower flow rates, and the axial dispersion increases as the flow rate increases.

Download Full-text

Continuous-Flow Precipitation of Hydroxyapatite at 37 °C in a Meso Oscillatory Flow Reactor

Industrial & Engineering Chemistry Research ◽

10.1021/ie400710b ◽

2013 ◽

Vol 52 (29) ◽

pp. 9816-9821 ◽

Cited By ~ 15

Author(s):

Filipa Castro ◽

António Ferreira ◽

Fernando Rocha ◽

António Vicente ◽

José António Teixeira

Keyword(s):

Continuous Flow ◽

Oscillatory Flow ◽

Flow Reactor

Download Full-text

Performance of Oscillatory Flow Reactor and Stirred Tank Reactor in Solvent Fermentation form Palm Oil Mill Effluent

Jurnal Teknologi ◽

10.11113/jt.v47.276 ◽

2007 ◽

Vol 47 (1) ◽

Cited By ~ 1

Author(s):

Nasratun Masngut ◽

Mohd Sobri Takriff ◽

Abdul Wahab Mohammad ◽

Mohd Sahaid Kalil ◽

Abdul Amir Hassan Kadhum

Keyword(s):

Palm Oil ◽

Oscillatory Flow ◽

Flow Reactor ◽

Palm Oil Mill Effluent ◽

Stirred Tank ◽

Stirred Tank Reactor ◽

Tank Reactor ◽

Palm Oil Mill

Download Full-text

Improving CO2 mass transfer in microalgal cultures using an oscillatory flow reactor with smooth periodic constrictions

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2021.106505 ◽

2021 ◽

Vol 9 (6) ◽

pp. 106505

Author(s):

Ana L. Gonçalves ◽

Filipe Almeida ◽

Fernando A. Rocha ◽

António Ferreira

Keyword(s):

Mass Transfer ◽

Oscillatory Flow ◽

Flow Reactor ◽

Co2 Mass Transfer

Download Full-text

A Numerical Study on the Temperature Field of Oscillatory Flow Reactor with Conic Ring Baffles

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.455-456.121 ◽

2012 ◽

Vol 455-456 ◽

pp. 121-126 ◽

Cited By ~ 1

Author(s):

Peng Wu ◽

Jia Wu ◽

Wei Li

Keyword(s):

Heat Transfer ◽

Temperature Field ◽

Oscillatory Flow ◽

Flow Reactor ◽

Numerical Study ◽

Maximum Temperature ◽

Vortex Interaction ◽

3 Dimensional ◽

Bias Flow ◽

Experimental Researches

In published papers, the experimental researches have been carried out on heat transfer in Oscillatory Flow Reac-tors (OFRs) with annular baffles in both batch and continuous modes. It’s found that even with low net flow rates (or without net flow) the heat transfer properties of OFR can match turbu-lent pipe flow. But there’s no paper shows the micro-structure of temperature field in OFRs to illustrate the heat transfer mechan-ism. In this paper, we report our 3-dimensional numerical simu-lation results of heat transfer of OFR with novel conic ring baf-fles which is particularly suitable for liquid-solid systems. The temperature field of conic baffled OFR was obtained by using the commercial CFD package CFX11.0. It’s found that in “soft” mix-ing region the maximum temperature gradient lies approximate-ly in the middle of each cell, i.e. between the two pairs of vortices. It can be speculated that the convection caused by the intense vortex interaction leads to heat transfer essentially. When it’s global mixing, severe bias flow occurs. The temperature field becomes more chaotic and the heat convection is caused by more disordered vortex interaction.

Download Full-text