Journal Papers
- Öztabak, E., Gökkaya, O., and Ahn, H. “Heat transfer characteristics of horizontal supercritical CO2 flow through a microtube at low Reynolds numbers and its comparison with vertical flows”, Experimental Thermal and Fluid Science, vol. 147, 110957, 2023. https://doi.org/10.1016/j.expthermflusci.2023.110957
- Gökkaya, O., Öztabak, E., and Ahn, H. “Experimental investigation on heat transfer characteristics of supercritical CO2 flowing upward and downward through a microtube at low Reynolds numbers”, Experimental Thermal and Fluid Science, vol. 139, 110717, 2022. https://doi.org/10.1016/j.expthermflusci.2022.110717
- Öztabak, E., Gökkaya, O., and Ahn, H. “A novel method of measuring microtube wall temperatures by thermocouples to investigate sCO2 flows”, Applied Thermal Engineering, vol. 209, 118299, 2022. https://doi.org/10.1016/j.applthermaleng.2022.118299
- Unal, E., Ahn, H. and Sorguven E., Experimental Investigation on Flows in a Corrugated Channel, ASME J. Fluids Eng ; doi:10.1115/1.4032754, 2016.
- Sivas, D., Olcay, A.B. and Ahn, H., 2016, "Investigation of a corrugated channel flow with an open-source PIV software," EDP Sciences, 114, 02107, DOI: 10.1051/epjconf/201611402107.
- Ahn, H., Wave Propagation in Rapid Granular Flows, Journal of Applied Mechanics, 80, No.5, 051008, DOI: 10.1115/1.4023538, 2013.
- Ahn, H., Basaranoglu, Z., Yilmaz, M., Bugutekin, A., and Gul, M. Z., Experimental Investigation of Granular Flow Throughan Orifice. Powder Technology, 186, 2008, 65-71.
- Ahn, H., Computer Simulation of Rapid Granular Flow Through an Orifice, Journal of Applied Mechanics, 74, 2007, 111-118.
- Ahn, H., Brennen, C. E. and Sabersky, R. H., "Analysis of the Fully Developed Chute Flow of Granular Materials", Journal of Applied Mechanics, 59, 1992, 109-119.
- Ahn, H., Brennen, C. E. and Sabersky, R. H., "Measurements of Velocities, Velocity Fluctuations, Density, and Stresses for Chute Flows of Granular Materials", Journal of Applied Mechanics, 58, 1991, 792-803.
- Matthys, E. F., Ahn, H. and Sabersky, R. H., "Friction and Heat Transfer Measurements for Clay Suspensions with Polymer Additives", Journal of Fluids Engineering, 109, 1987, 307-312.
Conference Papers
- Ergin BAYRAK, Ali Bahadır OLCAY, Hojin AHN, Oğuzhan GÖKKAYA, Numerical investigation on thermofluid characteristics of vertical upward supercritical CO2 laminar flow through a circular microchannel, Proceedings of 22nd Ulusal Isı Bilimi ve Tekniği Kongresi (ULIBTK), Kocaeli, 11-14 September 2019.
- Sivas, D., Olcay, A.B., Ahn, H., Investigation of a corrugated channel flow with an open-source PIV software, Experimental Fluid Mechanics Conference, Prague, Czech Republic, 2015.
- Ahmet Cagri Develi and Hojin Ahn, 2015, Experimental Investigation on Friction and Acoustics in Corrugated Pipes, International Conference on Advances in Mechanical Engineering, Istanbul 2015 – ICAME2015-298.
- Hojin Ahn, Burhan Gul, Yavuz Sahin and Onur Hartoka, Experimental Investigation on the Condensation Efficiency of Humid Air in a Cross-Flow Condenser, Proceedings of the ASME International Mechanical Engineering Congress and Exposition, IMECE2013-64331, 2013, San Diego, USA.
- Hojin Ahn, Ibrahim Uslu, Experimental Investigation on Pressure Drop in Corrugated Pipes, Proceedings of the ASME International Mechanical Engineering Congress and Exposition, IMECE2013-66061, 2013, San Diego, USA.
- Efe Unal, Esra Sorguven and Hojin Ahn, Computational Investigation of Vortex Structure in the Corrugated Channel, Proceedings of the ASME International Mechanical Engineering Congress and Exposition, IMECE2013-66062, 2013, San Diego, USA.
- Efe Unal, Hojin Ahn and Esra Sorguven, Experimental Investigation of Vortex Structure in the Corrugated Channel, Proceedings of the ASME International Mechanical Engineering Congress and Exposition, IMECE2013-66063, 2013, San Diego, USA.
- Burhan GÜL , Hojin AHN, Yavuz ŞAHİN, Onur HARTOKA, Kondanser Kanal Boyutlarının Havada Bulunan Su Buharının Yoğuşmasına Etkilerinin Deneysel Araştırılması, Proceedings of 19th Ulusal Isı Bilimi ve Tekniği Kongresi (ULIBTK), Samsun, Turkey, ULIBTK13-037, 848-853.
- H. Ahn, Numerical Analysis of Convective Heat Transfer to Granular Flow, Proceedings of 18th Ulusal Isı Bilimi ve Tekniği Kongresi (ULIBTK), Zonguldak, Turkey, September 2011, ULIBTK2011-143.
- Selim Bozkurt, Koray K. Safak, Esra Sorguven, Suha Kucukaksu, Namik Ciblak, A. Fethi Okyar, Mehmet A. Akgun, Hojin Ahn, Nilufer Egrican and Ismail Lazoglu, Sol Karıncık Destek Cihazları İçin Kontrol Yöntemleri, Control Strategies for the Left Ventricular Assist Devices, 48, BIYOMUT 2009.
- Kocatepe, Y., Ahn, H., Aydın, C., Karacasu, A., Experimental investigation of a heat exchanger with a helical coil made of corrugated tubes, Proceedings of 17th Ulusal Isı Bilimi ve Tekniği Kongresi (ULIBTK), Sivas, 24-27 June 2009, ULIBTK09-ISI-082.
- H. Ahn, E. Yılmaz, M. Yılmaz, A. Büğütekin, Discharge of Granular Materials from Hoppers with Various Exit Geometries, Proceedings of the ASME International Mechanical Engineering Congress and Exposition, IMECE2007-41804, 2007, Seattle, USA.
- Sorguven, E., Ciblak, N., Okyar, A.F., Akgun, M.A., Egrican, A.N., Safak, K.K., Ahn, H., Lazoglu, I., Kucukaksu, S., Flow simulation and optimization of a left ventricular assist device, ASME International Mechanical Engineering Congress and Exposition, IMECE2007-41747, 11-15 November 2007, Seattle, USA .
- Ciblak, N., Okyar, A.F., Sorguven,E., Akgun, M.A., Kucukaksu, S., Ahn, H., Safak, K.K., Egrican, N., Ozsoy, B., Yenigul, O., Sehirlioglu, M., Lazoglu, I., Budak, E., Analysis and development of Heart Turcica Axial: Development of the first implantable axial left ventricular assist system in Turkey, 1. Ulusal Yapay Organlar ve Destek Sistemleri Kongresi, 15-17 June 2007, Istanbul, Turkey.
- Lazoglu, I., Demir, O., Yildiz, G., Kucukaksu, S., Okyar, A.F., Cıblak, N., Akgun, M., Sorguven, E., Ahn, H., Safak, K.,Egrican, N., From Concept to the Prototype of Heart Turcica Centrifugal: Development of the First Implantable Centrifugal Left Ventricular Assist System in Turkey, 1. Ulusal Yapay Organlar ve Destek Sistemleri Kongresi, 15-17 June 2007, Istanbul, Turkey.
- Küçükaksu, S., Göksedef, D., Bülbül, S., Yıldız, C.E., Çıblak, N., Lazoğlu, I., Sorgüven Öner, E., Akgün, M., Okyar, A.F.,Şafak, K.K., Ahn, H., Şehirlioğlu, M., Uçak, C., Eğrican, N., The prototype of the first Turkish axial pump for the treatment of end-stage cardiac failure, International Society for Rotary Blood Pumps (ISRBP) 14th Congress, 31 August-2 September 2006, Leuven, Brussels.
- Ahn, H., An Implicit Method for Numerically Stiff Venting Problems in Honeycomb and Other Multicell Configurations, AIAA-94-2361, 25th AIAA Fluid Dynamics Conference, 1994.
- Ruth, E. K., Ahn, H., Baker, R. L. and Brosmer, M. A., Advanced Liquid Rocket Engine Transient Model, AIAA-90-2299,26th AIAA/ASME Joint Propulsion Conference, 1990.
- Ahn, H., Brennen, C. E. and Sabersky, R. H., Experiments on Chute Flows of Granular Materials, Proceedings of the US-Japan Seminar on Micromechanics of Granular Materials, 1987, Sendai-Zao, Japan.
- Matthys E.F., H. Ahn, and R.H. Sabersky. 1986. Experimental heat transfer and friction results for clay suspensions and their combination with polymers, International Symposium on Slurry Flows,1986, Vol. FED-38, pp. 203-209. New York: American Society of Mechanical Engineers.
Other Publications
- H. Ahn, 1996, “Implicit Multicell Venting Code User’s Manual.” Prepared for Space and Missile Systems Center - Air Force Material Command (Contract No. F04701-93-C-0094), Aerospace Report No. TOR-96(1414)-11
- H. Ahn and C. E. Brennen, 1992, Channel flows of granular material and their rheological implications. Particulate Two-phase Flow, (ed. M. C. Roco), Butterworth-Heinemann, 210-243.
- H. Ahn, 1989, “Experimental and analytical investigations of granular materials: shear flow and convective heat transfer.” Ph.D. Thesis, California Institute of Technology.
International Patents
- A laundry dryer the drying effectiveness of which is increased by using different heat sources
Onur Hartoka, Yavuz Şahin, Erdem An, Mehmet Kaya.
WO2011000704 (A1) ― 2011-01-06
US2012167404 (A1) ― 2012-07-05
US9157179 (B2) ― 2015-10-13 US Patent granted
EP2449163 (A1) - 2012-05-09
EP2449163 (B1) - 2013-04-17 European Patent granted
CN102471987 (A) - 2012-05-23
CN102471987 (B) ― 2014-11-12 China Patent granted
ES2414408 (T3) ― 2013-07-19 Spain Patent translated
- A laundry dryer the drying effectiveness of which is increased
Onur Hartoka, Yavuz Şahin, Erdem An, Mehmet Kaya
WO2011000705 (A1) ― 2011-01-06
EP2449164 (A1) ― 2012-05-09
EP2449164 (B1) ― 2013-03-20 European Patent granted
- Thermoelectric heat pump laundry dryer
Yavuz Şahin, Doğan Demirhan, Mehmet Kaya, Erdem An
WO2012062677 (A1) ― 2012-05-18
EP2638202 (A1) ― 2013-09-18
EP2638202 (B1) ― 2016-01-27 European Patent granted
CN103201424 (A) ― 2013-07-10
CN103201424 (B) ― 2015-12-02 China Patent granted
Erdem An, Onur Hartoka, Mehmet Kaya, Yavuz Şahin
WO2012089603 (A2) ― 2012-07-05
WO2012089603 (A3) ― 2013-06-06
- Laundry dryer with air-cooled condenser
Yavuz Şahin, Mehmet Kaya, Erdem An
WO2013182403 (A1) – 2013-12-12
- Laundry dryer with air-cooled condenser
Yavuz Şahin, Mehmet Kaya, Erdem An
WO2013182405 (A2) – 2013-12-12
WO2013182405 (A3) - 2014-05-30
EP2855756 (A2) ― 2015-04-08
EP2855756 (B1) ― 2017-01-11 European Patent granted
- A thermoelectric heat pump laundry dryer
Sahin Yavuz; Kaya Mehmet; An Erdem; Hartoka Onur
WO2014180696 (A1) - 2014-11-13
EP2994566 (A1) - 2016-03-16
Projects
Experimental investigation on heat transfer and pressure drop characteristics of supercritical CO2 flows near the critical point through horizontal and vertical microtubes, Principal Investigator, 10/2019 - 04/2022, TÜBİTAK 1001 (119M051).
