Dr. Kayhan Develi
PhD degree from Istanbul Tech. Univ., Geological Eng. Dept., Turkey
(Primary supervisor: Dr. Mahir Vardar
Co-supervisor: Dr. Tayfun Babadagli - between 1996 and 2002)
(Visit period: January 23, 2008 - Sept. 23, 2008)
"Experimental modeling of single and multi phase flow in a rough-single fracture"
Dr. Develi specialized in the following research areas during his PhD research:
1- Fractal characterization of fracture surface roughness
2- Effect of surface roughness on the mechanical behavior of fractured rocks
His current post doctoral research is on “Experimental modeling of single and multi phase flow in a rough-single fracture”.
Cube shaped samples taken from lithologically different types of rocks were subject to Brazilian tests to create artificial -single- fractures (Figure 1).
Then, transparent replicas were casted from the original fractures (Figure 2). The surfaces of transparent fracture models were scanned and
digitized by means of a computer-controlled surface scanning device (Figure 3) which was designed and developed duirng his doctoral study.
A 3-D image of the surface is shown in Figure 4. Finally, different fractal methods were applied to 2-D surface data and the fractal dimensions
of the surfaces were calculated. Currently, single and multi phase fluid flow tests are conducted on the transparent samples shown in Figure 2.
Figure 1: Fractured rock samples after the Brazilian tests and general view of the artificial fracture surfaces
Figure 2: Transparent models casted from original rock fracture surfaces
Figure 3: Computer-controlled surface scanning device
(The new version of the “a new computer-controlled surface scanning device” previously introduced by Develi, Babadagli and Comlekci, 2000)
Figure 4: 3-D surface view of fracture sample Fr1 obtained from surface scanning process.
- Develi, K. and Babadagli, T., 1998. Quantification of natural fracture surfaces using fractal geometry. Mathematical Geology 30 (8), 971-998.
- Develi, K. and Babadagli, T., 2000. Author’s Reply to Comments on “Quantification of Natural Fracture Surfaces Using Fractal Geometry”,
Mathematical Geology 32 (4) 517-520.
- Develi, K., Babadagli, T and Comlekci, C., 2000. A new computer controlled surface
scanning device for measurement of fracture surface roughness, Comput. Geosci. 27 (3) 265–277.
- Babadagli, T. and Develi, K., 2001. On the application of methods used to calculate the fractal dimension of fracture surfaces,
Fractals 9 (1) 105-128.
- Babadagli, T. and Develi, K., 2003. Fractal characteristics of rocks fractured under tension, Theoretical and Applied Fracture Mechanics 39, 73-88.
- Develi, K. and Vardar, M., 2006. Quantification of surface roughness and its effect on the shear strength of a discontinuity.
Journal of ITU, Series D; Engineering, 5 (4) 69-82.
- Babadagli, T. and Develi, K., 1998. Fracture Surface Characterization by Fractal Methods and Effect of Fractal Dimension on Fluid Transport Efficiency,
in: 12th Petroleum Cong. and Exh. of Turkey, Ankara, Turkey, Oct. 12-15, pp. 295-304.
- Babadagli, T. and Develi, K., 1998. Analysis of Fracture Development and Propagation Using Fractal Methods,
in: 12th Petroleum Cong. And Exh. of Turkey, Ankara, Turkey, Oct. 12-15, pp.389-397
- Develi, K. and Vardar, M., 1998. Quantitative definition of discontinuity surface roughness by using fractal geometry,
Proc. of the 4th National Rock Mech. Symp, 22-23 October, Zonguldak / Turkey, pp. 217-225
- Babadagli, T. and Develi, K., 2000. Fractal Analysis of Natural and Synthetic Fracture Surfaces of Geothermal Reservoir Rocks,
in: 2000 World Geothermal Congress, Kyushu-Tohoku, Japan, May 28-June 10, pp. 2515-2520.
- Babadagli, T. and Develi, K., 2000. Fractal Fracture Surfaces and Its Effect on Fluid Displacement Efficiency,
in: 31st Int.Geological Cong. Rio De Janeiro, Brasil, Aug. 6-17.
- Babadagli, T. and Develi, K., 2001. Fractal fracture surfaces and fluid displacement process in fractured rocks,
Paper No. ICF100570OR, 10th Int. Conf. of Fracture, 3–7 December, Honolulu, Oahu, Hawaii.
- Develi, K., 2006. Quantification of surface roughness with theoretical and experimental methods for mechanical modeling
of jointed rocks. PhD thesis, Istanbul Technical University, Istanbul, Turkey, 258 p.