Next Article in Journal
Combined Effect of Colloids and SMP on Membrane Fouling in MBRs
Previous Article in Journal
Electrochemical Characteristics of Glycerolized PEO-Based Polymer Electrolytes
Open AccessArticle

A Molecular Dynamics Study on Rotational Nanofluid and Its Application to Desalination

1
Civil and Environmental Engineering, University of California, Berkeley, CA 94720, USA
2
Amador Valley High School, Pleasanton, CA 94566, USA
3
Granada High School, Livermore, CA 4550, USA
*
Author to whom correspondence should be addressed.
Membranes 2020, 10(6), 117; https://doi.org/10.3390/membranes10060117
Received: 13 April 2020 / Revised: 28 May 2020 / Accepted: 3 June 2020 / Published: 6 June 2020
(This article belongs to the Special Issue Numerical Modeling and Performance Prediction of Nanofiltration)
In this work, we systematically study a rotational nanofluidic device for reverse osmosis (RO) desalination by using large scale molecular dynamics modeling and simulation. Moreover, we have compared Molecular Dynamics simulation with fluid mechanics modeling. We have found that the pressure generated by the centrifugal motion of nanofluids can counterbalance the osmosis pressure developed from the concentration gradient, and hence provide a driving force to filtrate fresh water from salt water. Molecular Dynamics modeling of two different types of designs are performed and compared. Results indicate that this novel nanofluidic device is not only able to alleviate the fouling problem significantly, but it is also capable of maintaining high membrane permeability and energy efficiency. The angular velocity of the nanofluids within the device is investigated, and the critical angular velocity needed for the fluids to overcome the osmotic pressure is derived. Meanwhile, a maximal angular velocity value is also identified to avoid Taylor-Couette instability. The MD simulation results agree well with continuum modeling results obtained from fluid hydrodynamics theory, which provides a theoretical foundation for scaling up the proposed rotational osmosis device. Successful fabrication of such rotational RO membrane centrifuge may potentially revolutionize the membrane desalination technology by providing a fundamental solution to the water resource problem. View Full-Text
Keywords: reverse osmosis desalination; graphene membrane; molecular dynamics; nano-porous materials; rotational centrifuge reverse osmosis desalination; graphene membrane; molecular dynamics; nano-porous materials; rotational centrifuge
Show Figures

Figure 1

MDPI and ACS Style

Tu, Q.; Ibrahimi, W.; Ren, S.; Wu, J.; Li, S. A Molecular Dynamics Study on Rotational Nanofluid and Its Application to Desalination. Membranes 2020, 10, 117.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop