### ANALYSIS OF SINGLE PHASE FLUID FLOW AND HEAT TRANSFER AT MICRO-SCALE

#### Devam Eden Proje

### PROJECT DURATION

Start Date: January 1st, 2010

### PEOPLE

### SUMMARY

With the today’s fabrication facility, fabrications of channels with a size in the order of micrometers are not an issue (even the fabrication of microtubes with the diameters of several micro-meters/nanometers have become possible). These kinds of small channels can easily be the elements of microheat exchangers, microheat sinks, microsensors, and micropower generation systems. For an effective and economical design of microfluidic systems, fluid flow and heat transfer characteristics of flow at micro-scale need to be well understood. As fluid flow and heat transfer takes place at the micro-scale, many additional effects such as rarefaction, electro-viscous effects, viscous dissipation, and axial conduction need to be considered which can be neglected at the macro-scale. Rarefaction is important for small dimensions compared to the mean-free-path of the fluid (less than 5 um at atmospheric conditions), and is common for gas flows in microchannels. Electro-viscous effects are due to the interaction of the ions in the fluid with the electrical double layer (EDL) near the non-conducting channel wall, and is significant for liquid flow in microchannels with dimensions less than 5 lm for deionized water. Viscous dissipation is the heating of the fluid due to the work done against the viscous forces. The effect of viscous dissipation can be important for flows with Rey- nolds number (Re) greater than 100 for microchannels. Moreover, the characteristic time for convection and conduction become comparable at the micro- scale, and the convection term no longer dominates the conduction term in the longitudinal direction. This is defined by flow for which the Peclet number (Pe) is not too large. Under this condition axial conduction in the fluid cannot be neglected as in the case of mac- rochannel flow. The effect of the axial conduction in the fluid becomes more pronounced as Pe decreases. In conventional applications involving channels, the channel-wall thickness is very small compared to the hydraulic diameter of the channel; hence the heat transferred by conduction in the wall can be neglected compared to the convective heat transfer in many macroscale flows. However, in microchannels the thickness of the channel wall is usually equal in size or larger than the hydraulic diameter of the channel. Therefore the heat trans- ferred in the wall by conduction cannot be neglected for the case of convective liquid flow in a microchannel, and the heat transfer mechanism becomes conjugate. Therefore, the investigation of role of these parameters on fluid flow and heat transfer is important for a better fundamental understanding, and useful in the analysis and design of micro-scale heat transfer devices.

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*5th Micro and Nano Flows Conference*, Full Text - Rasooli, R., Karaoğlu, O.K., Çetin, B. (2016). "Simulation of particle flow in a spiral microchannel for inertial microfluidics",
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*2nd Novel Fluidic Technologies and Applications Workshop* - A.G. Demir,, B. Previtali,, Barbaros Çetin (2015). "Laser micro-milling for the manufacturing of microfluidic device mold",
*8th Int. Conference and Exhibition on Design and Production of Machines and Dies/Molds*(Submitted), Full Text - Taze, S., Çetin, B., Dursunkaya, Z. (2015). "Multi-physics modeling of silicon micro-grooved heat pipe",
*8th International Conference on Computational Heat and Mass Transfer(139)*, Full Text - Çetin, B., Cole, K. (2015). "Modeling of conjugate heat transfer in an electrically heated microtube",
*8th International Conference on Computational Heat and Mass Transfer(140)*, Full Text - Çetin, B., Çelik, B., Sert, C. (2015). "Analysis of heat transfer in slip-flow regime by parallel implementation of Lattice-Boltzmann method on GPUs",
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*4th Micro and Nano Flows Conference*, Full Text - Baranoğlu, B., Çetin, B. (2014). "A particle flow specific boundary element formulation for microfluidic applications",
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*18th National Mechanics Conference* - Çagatay, E., Altınok, M.F., Çetin, B. (2013). "Analysis of gas power cycyles and Brayton refrigeration cycles using MATLAB",
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*ASME 2013 Summer Heat Transfer Conference(17305)*p.V002T11A001, DOI: http://dx.doi.org/10.1115/HT2013-17305 - Çetin, B., Taze, S., Aşık, M., Tuncel, A. (2013). "Microfluidic device for synthesis of chitosan nanoparticles",
*ASME 2013 Fluid Engineering Summer Meeting (16349)*p.V002T21A006, DOI: http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1790157 - Çetin, B. (2012). "Evaluation of Nusselt number for a ﬂow in a microtube with second-order model including thermal creep",
*10th Int. Conf. Nano/Micro/Mini-channels (ICNMM’2012)(73321)*p.251-256, DOI: http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1719023 - Çelik, B.S., Sert, C., Çetin, B. (2011). "Simulation of lid-driven cavity flow by parallel implementation of Lattice-Boltzmann method on GPUs",
*2nd International Symposium on Computing in Science and Engineering (ISCSE'11)*, Full Text - Çelik, B.S., Sert, C., Çetin, B. (2011). "Simulation of channel flow by parallel implementation of thermal Lattice-Boltzmann method on GPUs",
*7th International Conference on Computational Heat and Mass Transfer (ICCHMT'2011)*, Full Text - Çetin, B., Taze, S., Ozturk, Y. (2011). "Viscous flow calculations for undergraduate fluid mechanics education using MATLAB",
*18th National Conference on Thermal Sciences*, Full Text - Güler, K.G., Çetin, B. (2011). "Simulation of elektrokinetic manipulation of particle inside microchannels",
*18th National Conference on Thermal Sciences*, Full Text - Gürol, Y., Çelik, S.B., Çetin, B. (2011). "Simulation of 2D electro-osmotic flow inside microchannels using Lattice-Boltzmann method on GPUs",
*18th National Conference on Thermal Sciences*, Full Text - Çetin, B., Bayer, O. (2010). "Evaluation of Nusselt number for a flow in a microtube with constant heat flux including axial conduction, viscous dissipation and second-order slip model",
*The 3rd International Symposium on Nonlinear Dynamics (ISND 2010)*, Full Text - Bulut, B., Barbaros Çetin,, Yazıcıoğlu, A., Kakaç, S. (2009). "Finite element analysis of gaseous flow in microchannels with axial conduction",
*17th National Conference on Thermal Sciences*p.308-314, Full Text - Çetin, B., Li, D. (2008). "Microfluidic continuous particle separation via AC-DEP with 3D electrodes",
*ASME International Mechanical Engineering Congress and Exposition (IMECE'08)*p.217-222, DOI: http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1641393 - Bulut, B., Çetin, B., Yazıcıoğlu, A.G., Yuncu, H., Kakaç, S. (2007). "The analysis of the effect of axial conduction on single-phase convective heat transfer in microtubes",
*16th National Conference on Thermal Sciences*, Full Text - Çetin, B., Li, D. (2007). "Modeling and simulation of 2D, EOF in a slit channel with Joule heating effect",
*16th National Conference on Thermal Sciences*, Full Text - Çetin, B., Yuncu, H., Kakaç, S. (2005). "Single-phase convective heat transfer in microtubes",
*15th National Conference on Thermal Sciences*, Full Text - Bayer, O., Çetin, B., Dirgin, E. (2003). "COP-Irreversibility relation in household refrigerators",
*14th National Conference on Thermal Sciences*, Full Text - Rasooli, R., Çetin, B. (2019). "An extended Langhaar's solution for two-dimensional entry microchannel flows with high-order slip",
*Mathematics Applied to Engineering, Modelling, and Social Issues (Editors: Frank Smith, Hemen Dutta and John N. Mordeson), Springer*p.189-212, Full Text, DOI: http://dx.doi.org/https://doi.org/10.1007/978-3-030-12232-4 - Çetin, B., Güler, K.G., Aksel, M.H. (2017). "Computational modeling of vehicle radiators using porous medium approach",
*Heat Exchangers -- Design, Experiment and Simulation (Edited by Prof. S. M. Sohel Murshed, Prof. M. L. S. Matos Lopes) InTech*p.243–262, Full Text - Yeşil-Çeliktaş, Ö., Çetin, B., Yıldırım, E. (2016). "Mikroakışkan Sistemlere Yönelik Gelecek Tahminleri",
*Mikroakışkan Teknolojilerin Temelleri ve Uygulamaları (Edited by Assoc. Prof. Ö. Yeşil-Çeliktaş)* - Yavuz, C., Çetin, B., Yeşil-Çeliktaş, Ö. (2016). "Mikroakışkan Sistemlerin Sterilizasyonu",
*Mikroakışkan Teknolojilerin Temelleri ve Uygulamaları (Edited by Assoc. Prof. Ö. Yeşil-Çeliktaş)* - Çetin, B., Yıldırım, E., Akay, Ş. (2016). "Mikroakışkan Sistemlerin Üretimi",
*Mikroakışkan Teknolojilerin Temelleri ve Uygulamaları (Edited by Assoc. Prof. Ö. Yeşil-Çeliktaş)* - Çetin, B., Li, D. (2015). "Temperature Gradient Generation and Control",
*Encyclopedia of Micro and Nanoﬂuidics (2nd Edition), Springer*p.3225-3227, Full Text - Çetin, B., Baranoğlu, B. (2015). "Boundary-Element Method in Microfluidics",
*Encyclopedia of Micro and Nanoﬂuidics (2nd Edition), Springer*p.202-213, Full Text, DOI: https://link.springer.com/referenceworkentry/10.1007%2F978-3-642-27758-0_121-6 - Çetin, B., Salemmilani, R., Li, D. (2015). "Microfluidic Rotary Pump",
*Encyclopedia of Micro and Nanoﬂuidics (2nd Edition), Springer*p.2000-2004, Full Text, DOI: https://link.springer.com/referenceworkentry/10.1007%2F978-3-642-27758-0_944-7 - Çetin, B., Salemmilani, R., D. Li (2015). "Ultrasonic pumps",
*Encyclopedia of Micro and Nanoﬂuidics (2nd Edition), Springer*p.3394-3397, Full Text, DOI: https://link.springer.com/referenceworkentry/10.1007%2F978-3-642-27758-0_1646-8 - Çetin, B., Zeinali, S., Li, D. (2015). "Microfluidic Optical Devices",
*Encyclopedia of Micro and Nanoﬂuidics (2nd Edition), Springer*p.1980-1984, Full Text, DOI: https://link.springer.com/referenceworkentry/10.1007%2F978-3-642-27758-0_940-6 - Çetin, B., Zeinali, S., Li, D. (2015). "Magnetic Pumps",
*Encyclopedia of Micro and Nanoﬂuidics (2nd Edition)*p.1690-1695, Full Text, DOI: https://link.springer.com/referenceworkentry/10.1007%2F978-3-642-27758-0_843-6 - Çetin, B., Taze, S., Li, D. (2015). "Methods for Pressure Measurements",
*Encyclopedia of Micro and Nanoﬂuidics (2nd Edition), Springer*p.2828-2834, Full Text, DOI: https://link.springer.com/referenceworkentry/10.1007%2F978-3-642-27758-0_1296-7 - Büyükkoçak, S., Özer, M.B., Çetin, B. (2015). "Microscale Acoustofluidics",
*Encyclopedia of Micro and Nanoﬂuidics (2nd Edition), Springer*p.2149-2158, Full Text, DOI: https://link.springer.com/referenceworkentry/10.1007%2F978-3-642-27758-0_1735-4 - Çetin, B., Li, D. (2008). "Microﬂuidic Rotary Pump",
*Encyclopedia of Micro and Nanoﬂuidics (1st Edition), Springer*p.1188-1189, Full Text - Çetin, B., Li, D. (2008). "Temperature Gradient Generation and Control",
*Encyclopedia of Micro and Nanoﬂuidics (1st Edition), Springer*p.1993-1994, Full Text - Çetin, B., Li, D. (2008). "Methods for Pressure Measurements",
*Encyclopedia of Micro and Nanoﬂuidics (1st Edition), Springer*p.1743-1745, Full Text - Çetin, B., Li, D. (2008). "Magnetic Pumps",
*Encyclopedia of Micro and Nanoﬂuidics (1st Edition), Springer*p.1040-1043, Full Text - Çetin, B., Li, D. (2008). "Microﬂuidic Optical Devices",
*Encyclopedia of Micro and Nanoﬂuidics (1st Edition), Springer*p.1186-1187, Full Text - Çetin, B., Li, D. (2008). "Ultrasonic pumps",
*Encyclopedia of Micro and Nanoﬂuidics (1st Edition), Springer*p.2128-2129, Full Text - H. Dilara Uslu (Advisor: Assoc. Prof. Dr. Barbaros Çetin) (2018). "Investigation of AC electro-osmotic flow based microfluidic mixer with micro rods",
*Bilkent University, Mechanical Engineering Department* - Gamze Düven (Co-advisor: Asst. Prof. Dr. Barbaros Çetin) (2017). "Determination of microbial load and somatic cell count in milk with lab-on-a-chip device",
*Ege University, Department of Food Engineering* - Hossein Alijani Alijanvad (Advisor: Asst. Prof. Dr. Barbaros Çetin) (2017). "Thermal performance characterization of flat grooved heat pipes",
*Bilkent University, Mechanical Engineering Department* - Reza Rasooli (Advisor: Asst. Prof. Dr. Barbaros Çetin) (2017). "Modeling of inertial particle flow and entry gas flow in micro-channels",
*Bilkent University, Mechanical Engineering Department* - Serdar Taze (Advisor: Asst. Prof. Dr. Barbaros Çetin) (2015). "Modeling and fabrication of silicon micro-grooved heat pipes",
*Bilkent University, Mechanical Engineering Department*, Full Text - Gizem Bedir (Co-advisor: Asst. Prof. Dr. Barbaros Çetin) (2015). "Forward problem of electrocardiography in terms of transmembrane potentials within 3D heart",
*METU Electrical and Electronics Engineering Department*, Full Text - Soheila Zeinali (Advisor: Asst. Prof. Dr. Barbaros Çetin) (2014). "Microfluidic device with 3D electrode structure for high throughput dielectrophoretic applications",
*Bilkent University, Mechanical Engineering Department*, Full Text - Kadir G. Güler (Co-advisor: Asst. Prof. Dr. Barbaros Çetin) (2014). "Computational modeling of fin-and-tube type vehicle radiators based on porous medium approach",
*METU, Department of Mechanical Engineering*, Full Text - A. Koray Koska (Advisor: Asst. Prof. Dr. Barbaros Çetin) (2013). "Injection molding of polymeric microfluidic devices",
*Bilkent University, Mechanical Engineering Department*, Full Text - S. Berat Çelik (Co-advisor: Asst. Prof. Dr. Barbaros Çetin) (2012). "Analysis of single phase fluid flow and heat transfer in slip-flow regime by parallel implementation of Lattice-Boltzmann Method on GPUs",
*METU, Department of Mechanical Engineering*, Full Text - Mehmet Doğan Aşık (Co-supervisor: Asst. Prof. Dr. Barbaros Çetin) (2017). "Design and fabrication of a novel microfluidic device for the synthesis of bio-polimeric nanoparticles",
*Hacettepe University, Nanotechnology and Nanomedicine* - Çetin, B. (2009). "Microﬂuidic Continuous Separation of Particles and Cells by using AC-Dielectrophoresis",
*Vanderbilt University, Department of Mechanical Engineering*, Full Text