Transport Phenomena in Nanofluids and Nanofluids Saturated Porous Media

General fluids used in industrial processes involving heat transfer (energy generation, insulation, cooling of microelectronic components) are water, mineral oil and ethylene glycol. Physical properties of these fluids limit the efficiency of heat transport and large amount of cooling fluid is necessary. Because of the increasing necessity of modern technologies, including chemical processes, microelectronics, biotechnology, it is very important to obtain new type of fluids, having improved heat transfer characteristics. In order to enhance the thermal characteristics of the fluids one can form mixtures by adding ultra fine solid particles to the fluid. It was found that particles in the order of millimeter or even micrometers added in fluids may cause some severe inconvenient such as clogging of flow channels, erosion of pipelines, an increase in pressure drop, and sedimentation problems. The use of particles of nanometer dimension leads to mixtures with highly improved thermal characteristics and without the severe problems shown before. Nanofluids are new types of fluids containing small fractions of nanoparticles, usually smaller than 100nm, which are uniformly and stable suspended in a liquid. for heat transfer intensification, in industrial sectors including power generation, thermal therapy for cancer treatment, chemical sectors, ventilation.The objective of this project is to model fluid flow and heat transfer in nanofluids and nanofluid saturated porous media.

• Director:

Dr. Teodor Grosan (CV)

• Team Members:

Dr. Radu Trimbitas (CV)
Dr. Alin Rosca (CV)
Dr. Flavius Patrulescu (CV)


• Objectives:

O1. Study of convective heat transfer in nanofluids using boundary layer approximation
O2. Study of convective heat transfer in nanofluids saturated porous media using boundary layer approximation
O3. Study of convective heat transfer in channels and enclosures filed with nanofluids
O4. Study of convective heat transfer in channels and enclosures filed with nanofluid saturated porous media
O5. Study the effects of variable physical properties and heat generation on convective heat transfer in nanofluids


• Results:

In the period 5.10.2011-4.10.2014 were published in ISI Journals the following papers:


1.	T. Grosan, Thermal dispersion effect on fully developed free convection of nanofluids in a vertical channel, Sains Malayesiana, Vol. 40(12),pp. 1429-1435, 2011. Factor de impact: 0.408, (cu suport partial din grantul PN-II-RU-TE-2011-3-0013)
2.	T. Grosan, I. Pop, Fully Developed Mixed Convection in a Vertical Channel Filled by a Nanofluid, Journal of Heat Transfer-Transaction of the ASME, Volume 134, Issue 8, 082501 (5 pages), 2012. Factor de impact: 1.83, (cu suport partial din grantul PN-II-RU-TE-2011-3-0013)
3.	A. V. Rosca, N. C. Rosca, T. Grosan, I. Pop, Non-Darcy mixed convection from a horizontal plate embedded in a nanofluid saturated porous media, International Communications in Heat and Mass Transfer, Vol. 39 pp. 1080-1085, 2012. Factor de impact: 2.208
4.	N. C. Rosca, T. Grosan, I. Pop, Stagnation-point Flow and Mass Transfer with Chemical Reaction Past a Permeable Stretching/shrinking Sheet in a Nanofluid, Sains Malayesiana, Vol. 41, pp. 1271-1279, 2012. Factor de impact: 0.408
5.	A.V. Rosca, I. Pop, Flow and heat transfer over a vertical permeable stretching/shrinking sheet with a second order slip, Intrnational Journal of Heat and Mass Transfer, Vol. 60, pp. 355-364, 2013. Factor de impact: 2.315
6.	A V. Rosca, I. Pop, Mixed Convection Stagnation-Point Flow Past a Vertical Flat Plate With a Second Order Slip, Journal of Heat Transfer-Transaction of the ASME, Vol. 136, Issue 1, 012501 (8 pages), 2014. Factor de impact: 2.055
7.	T. Grosan, J.H. Merkin, I. Pop, Mixed convection boundary-layer flow on a horizontal flat surface with a convective boundary condition, Meccanica, Vol. 48, pp. 2149-2158, 2013. Factor de impact: 1.747
8.	R. Trimbitas, T. Grosan, I. Pop, Mixed convection boundary layer flow along vertical thin needles in nanofluids, International Journal of Numerical Methods for Heat and Fluid Flow, Vol. 24, pp. 579-594, 2014. Factor de impact: 0.919
9.	F.O. Patrulescu, T. Grosan, I. Pop, Mixed convection boundary layer flow from a vertical truncated cone in a nanofluid Int. Journal of Numerical Methods for Heat and Fluid Flow, Vol. 24, pp. 1175-1190, 2014. Factor de impact: 0.919
10.	N.C. Rosca, A.V. Rosca, T. Grosan, I. Pop, Mixed convection boundary layer flow past a vertical flat plate embedded in a porous medium saturated by a nanofluid: Darcy-Ergun model, International Journal of Numerical Methods for Heat and Fluid Flow, Vol. 24, pp. 970-987, 2014. Factor de impact: 0.919
11.	N.C. Rosca, A.V. Rosca, I. Pop, Stagnation point flow and heat transfer over a non-linearly moving flat plate in a parallel free stream with slip, Communications in Nonlinear Science and Numerical Simulation, Volume: 19 Issue: 6 Pages: 1822-1835, 2014. Factor de impact: 2.569
12.	M.A. Sheremet, T. Grosan, I. Pop, Free Convection in Shallow and Slender Porous Cavities Filled by a Nanofluid Using Buongiorno's Model, Journal of Heat Transfer-Transaction of the ASME, Vol. 136, Article Number: 082501, DOI: 10.1115/1.4027355, 2014. Factor de impact: 2.055



In the period 5.10.2011-15.12.2013 were accepted or sent for publication in ISI Journals the following papers::


13.	N. C. Rosca, A. V. Rosca, J. H. Merkin and Ioan Pop, Mixed convection boundary-layer flow near the lower stagnation point of a horizontal circular cylinder with a second-order wall velocity condition and a constant surface heat flux, IMA Journal of Applied Mathematics (2013) Page 1 of 21, doi:10.1093/imamat/hxt045, accepted, in press
14.	A. V. Rosca, MD. J. Uddin, I. Pop, Boundary layer flow over a moving vertical plate with convectie thermal boundary condition, Bulletin of the Malaysian Mathematical Sciences Society, accepted, February, 2014.
15.	R. Trimbitas, T. Grosan, I. Pop, Mixed convection boundary layer flow past a vertical flat plate in a nanofluid: case of prescribed wall heat flux, Applied Mathematics and Mechanics, accepted.
16.	M.A. Sheremet, T. Grosan, I. Pop, Steady-state free convection in right-angle porous trapezoidal cavity filled by a nanofluid: Buongiorno’s mathematical model, European Journal of Mechanics - B/Fluids, sent for publication.



In the period 5.10.2011-4.10.2014 were published the following books:


17.	T. Grosan, MODELAREA MATEMATICA A FENOMENELOR CONVECTIVE IN MEDII POROASE, (ISBN 978-606-17-0263-3), Casa Cartii de Stiinta Cluj-Napoca, 2012.
18.	A. V. Rosca, METODE DE SIMULARE MONTE CARLO CU APLICATII IN ECONOMIE, (ISBN 978-973-595-548-9), Casa Cartii de Stiinta Cluj-Napoca, 2013.



In the period 5.10.2011-4.10.2014 were published in conferences volumes the following papers:


19.	T.Grosan, C. Revnic, I. Pop, Free convection in a porous cavity filled with nanofluids, Latest Trends in Environmental and Manufacturing Engineering (Proceedings of the 5th WSEAS International Conference on Environmental and Geological Science and Engineering, Vienna, November 10-12, 2012), pp. 187-192.
20.	C. Revnic, T. Grosan, I. Pop, D.B. Ingham, Free convection heat transfer in a square cavity filled with a porous medium saturated by a water-based nanofluid, Proceedings of 5th International Conference on Applications of Porous Media 2013, August 25-28, Cluj-Napoca, Romania, ISSN 978-973-595-546-5, pp.349-357.
21.	N.C. Rosca, A.V. Rosca, I. Pop, Mixed convection boundary layer flow past a vertical flat plate embedded in a porous medium filled with water at 4?C with a convective boundary condition: opposing flow case, Proceedings of 5th International Conference on Applications of Porous Media 2013, August 25-28, Cluj-Napoca, Romania, ISSN 978-973-595-546-5, pp.359-369
22.	D.A. Filip, R. Trimbitas, I. Pop, Fully developed assisting mixed convection flow through a vertical porous channel with an anisotropic permeability: Case of heat flux, Proceedings of 5th International Conference on Applications of Porous Media 2013, August 25-28, Cluj-Napoca, Romania, ISSN 978-973-595-546-5, pp.145-156.



In period 5.10.2011-4.10.2014 the research team members have participated to the following conferences:


23.	F. Patrulescu, M. Barboteu, A. Ramadan, On the behavior of a the solution to a contact problem with memory term, International Conference on Fixed Point Theory and its Applications, 9-12 June 2012, Cluj-Napoca, Romania
24.	F. Patrulescu, A. Farcas, Analysis of a viscoplastic frictionless contact problem, XI-eme Colloque Franco-Roumain de Mathemtiques Appliques, 23-30 August 2012, Bucuresti, Romania
25.	R. Trimbitas and T. Grosan, Free convection heat transfer in a square cavity filled with a porous medium saturated by a water-based nanofluid in the presence of the internal heat generation, 3rd International Eurasian Conference on Mathematical Sciences & Applications, 25-28 August 2014, Vienna, Austria
26.	R. Trimbitas and T. Grosan, Fully developed fluid flow and heat transfer in a nanofluid saturated porous medium with internal heat generation, 3rd International Eurasian Conference on Mathematical Sciences & Applications, 25-28 August 2014, Vienna, Austria



In the period 5.10.2011-4.10.2014 the following research visits were done:


27.	Patrulescu Flavius, 23/07/2012 - 05/08/2012, Universite de Perpignan, Perpignan, France
28.	Pop Serban (invited), 11/02/2013 - 15/02/2013, Universitatea Babes-Bolyai, Cluj-Napoca, Romania
29.	Grosan Teodor,03/11/2013 - 08/11/2013, University of Leeds, Leeds, United Kingdom






• Scientific report: pdf
• Mini Cluster:


In order to deal with challenging numerical time consuming problems we start to build a minicluster. In present it is formed by eight nodes: Dell PowerEdge R210 II, 1U 1Socket, Intel Xeon E3-1230v2 Processor (3.3GHz, 4C/8T, 8M Cache, 69W, Turbo), 16GB Memory (4x4GB Dual Rank LV UDIMM) 1333MHz, 2*1TB SATA 7.2k 3.5". Due to the low power consumption there are no special needs for cooling. The operating system of the cluster is Rocks cluster. We started numerical experiments and it is worth to mention that the computing time for some very complex problems was significantly reduced.