The acitivities are executed through the POSTEC (Powder Science and Technology) department at Tel-Tek, with Professor Gisle Enstad as one of the main contributors. Please use the POSTEC link to find out more.

Selected publications

• de Silva SR. Characterisation of Particulate Materials. Powder Handling and Processing. 2000;12(4):355-63.
• Enstad GG, Ose S. Uniaxial testing and the performance of a pallet press. Chemical Engineering & Technology. 2003 Feb;26(2):171-6.
• Lindberg NO, Berdal A, Enstad G, Seifert E, Lundstedt T. Investigation of flow properties of powders by means of a uniaxial tester, in relation to direct tablet compression. Drug Development and Industrial Pharmacy. 2002;28(1):15-28.
• Nysaeter TO, Enstad GG. Effects of cyclic loading and various test conditions in a uniaxial tester. Part Part Syst Charact. 2007;24(4-5):271-5.
• Nysaeter TO, Enstad GG. Investigations of factors affecting the elasticity modulus of powders. Bulk Solids & Powder - Science & Technology. 2007;2(2).
• Le Noac'h L. Investigations on a Uniaxial Tester Developed by Tek-Tek, dept. POSTEC: Volontariat international Between RHODIA and POSTEC; 2002.
• Nysaeter TO, Enstad GG. Factors influencing the performance of a uniaxial tester for powder characterization. The 7th World Congress on Chemical Engineering. Glasgow, Scotland 2005.
• Nysaeter TO. Influence of various parameters on the results of the Uniaxial tester. POSTEC Newsletter. 2004(22):19-21.
• Nysaeter TO, Enstad GG. Influence of filling procedure on the failure strength of powders in a uniaxial tester. The 5th World Congress on Particle Technology. Orlando, USA 2006.
• Enstad GG, Sjoelyst KN. Testing of flow properties by means of a uniaxial tester, Investigation on the effect of filling procedures. 3rd Israeli Conference for Conveying and Handling of Particulate Solids; 2000 May 29- June 1 2000 The Dead Sea, Israel: The Forum for Bulk Solids Handling, ; 2000. p. 3.51-3.6.
• Beck R, Malthe-Soerenssen D, Andreassen J-P, Nysæter TO, Enstad GG. Influence of crystal properties on powders flow behaviour. RELPOWFLO IV. Tromsoe, Norway 2008.
• Andreassen J-P, Enstad GG. The CRYPOW project-A progress report. POSTEC Newsletter. 2006(24):6.
• Johansen K. Effekten av syklisk belastning under konsolidering og styrketesting i en uniaksialtester (Effect of cyclic loading during consolidation and failure tests in a uniaxial tester): Telemark University College; 2005.
• Nysaeter TO. Influence of stress history on flow properties. POSTEC Newsletter. 2005(23):17-8.
• Kleppe A. En studie av elastisitet, bulktetthet og syklisk belastning i en uniaksialtester (A study of elasticity, bulk density and cyclic loading in a uniaxial tester): Telemark University College; 2006.
• Nysaeter TO, Enstad GG. Effects of cyclic loading and various test conditions in a uniaxial tester. Particle & Particle Systems Characterization. 2007 Oct;24(4-5):271-5.
• Nysæter TO, Enstad GG. Elasticity studies of powders by means of a uniaxial tester. PARTEC 2007. Nürnberg, Germany 2007.
• Nysaeter TO. Elasticity measurements in the uniaxial tester. POSTEC Newsletter. 2006(24):7-9.
• A. Dyrøy, M. Karlsen, G. G. Enstad and S. de Silva: Air Current Segregation: Quatification of Effects and Avoidance, Proceedings of the 3rd Israeli Conference for Conveying and Handling of Particulate Solids, The Dead Sea Nirvana Hotel, May 29 – Jnue 1, 2000
• S. Ding, G. G. Enstad, M. Jecmenica and S. de Silva: Simulation of a Double Cone’s Effect on Granular Material Flow in Silos. 7th International Conference on Bulk Materials Storage, Handling and Transportation, Newcastle, Australia, October, 2001
• S. Ding, F. O. von Hafenbrädl, G. G. Enstad, M. JJecmenica and S. de Silva: Observations on the Change from Funnel Flow to Mass Flow in Silos by Means of a Double Cone. 7th International Conference on Bulk Materials Storage, Handling and Transportation. Newcastle, Australia, October, 2001
• G. G. Enstad: Sunil de Silva – A Scientist and a Visionary, Particulate Science and Technology,21:207– 210, 2003
• S. Ding, S. R. de Silva and G. G. Enstad: Effect of Passive Inserts on the Granular Flow from SilosUsing Numerical Solutions, Particulate Science and Technology, 21: 211 – 226, 2003
• M. Wojcik, G. G. Enstad and M. Jecmenica: Numerical Calculations of Wall Pressures and Stresses in Steel Cylindrical Silos with Concentric and Eccentric Hoppers, Particulate Science and Technology, 21: 247 – 258, 2003
• S. Ding, G. G. Enstad and S. R. de Silva: Development of Load on a Hopper During Filling with Granular Material, Particulate Science and Technology, 21: 259 – 270, 2003
• G. G. Enstad and S. Ose: Uniaxial Testing and the Performance of a Pallet Press, ChemicalEngineering & Technology, 26: 171 – 176, 2003
• N. O. Lindberg, M. Pålsson, A. C. Phil, T. Freeman, H. Zetzener and G. G. Enstad: Flowability measurements of pharmaceutical powder mixtures with poor flow, Drug Development and Industrial Pharmacy, Issue 7, p 785, 2004
• G. G. Enstad and K. N. Sjølyst: Investigation of the Effect of Filling Procedures on Testing of Flow Properties by means of a Uniaxial Tester, Proceedings of the 3rd Israeli Conference for Conveying and Handling of Particulate Solids, Volume 1, pp 3.51 – 3.56,The Dead Sea Nirvana Hotel, Israel, May 29 – June 1, 2000
• A. Dyrøy, M. Karlsen, G. G. Enstad and S. de Silva: Air Current Segregation: Quatification of Effects and Avoidance, Proceedings of the 3rd Israeli Conference for Conveying and Handling of Particulate Solids, The Dead Sea Nirvana Hotel, May 29 – June 1, 2000
• S. Ding, G. G. Enstad, M. Jecmenica and S. de Silva: Simulation of a Double Cone’s Effect on Granular Material Flow in Silos. 7th International Conference on Bulk Materials Storage, Handling and Transportation, Newcastle, Australia, October, 2001
• S. Ding, F. O. von Hafenbrädl, G. G. Enstad, M. Jecmenica and S. de Silva: Observations on the Change from Funnel Flow to Mass Flow in Silos by Means of a Double Cone. 7th International Conference on Bulk Materials Storage, Handling and Transportation. Newcastle, Australia, October, 2001
• S. Ding, J. Y. Ooi, M. Jecmenica, G. G. Enstad and S. R. de Silva: FE Investigations of the Effects of a Passive Insert on Flow Patterns in Silos, CHISA 2002, Praha, 25-29 August, 2002
• M. Wòjcik, M. Jecmenica and G. G. Enstad: Numerical Calculation of Wall Pressure and Stresses in Cylindrical Silos with conical Hoppers, SSTA 2002, The 7th Conference Shell Structures Theory and Applications, Gdansk – Jurata, 9 – 11 October, 2002
• S. Ding, G. G. Enstad, and S. R. de Silva: Flow and Pressure Measurements in a Full Scale Silo with a Double-Cone Insert, The 4th International Conference for Conveying and Handling of Particulate Solids, Budapest, May 2003.
• S. Ding and G. G. Enstad: FE approach to the sensitivity of load on a hopper to the filling method and process with granular material, Proceedings of IMECE’03 ASME International Mechanical Engineering Congress & Exposition, Washington, D.C., USA, November 16-21, 2003.
• S. Ding and G. G. Enstad: Effect of feeding rate on the loads measured along the wall of a full-scale hopper during filling, The Sixth Conference on Measurement and control of Granular Materials, Shanghai, China, Aug. 20-22, 2003.
• S. Ding, G. G. Enstad and F. O. von Hafenbrädl, 2004, Measurement of double cone inserts effects on the loads along a full-scale silo, POWTEC 2004, Nuremberg, Germany, March 15-19, 2004.
• T. O. Nysaeter and G. G. Enstad: Factors influencing the performance of a uniaxial tester for powder characterization, 7th World Congress on Chemical Engineering, Glasgow, 2005
• T. O. Nysaeter and G. G. Enstad: Influence of filling procedure on the failure strength of powders in a uniaxial tester, Proceedings, The 5th World Congress on Particle Technology, Orlando, USA, April 23 – 27, 2006.
• J. Härtl, M. Wojcik, J. Ooi, M. Rotter, S. Ding and G. G. Enstad: The influence of a cone-in-cone insert on flow pattern and wall pressure in a full-scale silo, Proceedings, The 5th World Congress on Particle Technology, Orlando, USA, April 23 – 27, 2006.
• S. Zigan, R. B. Thorpe, U. Tuzun and G. G. Enstad: Air current segregation of alumina powder, Proceedings, The 5th World Congress on Particle Technology, Orlando, USA, April 23 – 27, 2006.
• M. Wojcik, J. Härtl, J. Ooi, M. Rotter, S. Ding and G. G. Enstad: Experimental investigation of flow pattern and wall pressure distribution in a silo with doublecone insert, Proceedings, The 5th international Conference for Conveying and Handling of Particulate Solids, Sorrento, Italy, August 27 – 31, 2006.
• T. O. Nysaeter, A. Kleppe and G. G. Enstad: Effects of cyclic loading and various test conditions in a uniaxial tester, Proceedings, The 5th International Conference for Conveying and Handling of Particulate Solids, Sorrento, Italy, August 27 – 31, 2006.
• S. Ding, J. M. Rotter, J. Y. Ooi and G. G. Enstad: Pressure development along the walls of a conical hopper with a steep inclination angle, Proceedings, The 4th International Symposium Reliable Flow of Particulate Solids, June 10 – 12, 2008, Tromsø
• T. Schuricht, C. Fürll and G. G. Enstad: Experimental and calculated loads on “cone in cone” inserts, Proceedings, The 4th International Symposium Reliable Flow of Particulate Solids, June 10 – 12, 2008, Tromsø
• J. Härtl, J. Y. Ooi and G. G. Enstad: An experimental study of cone-in-cone inserts configuration in a full scale silo, Proceedings, The 4th International Symposium Reliable Flow of Particulate Solids, June 10 – 12, 2008, Tromsø
• S. Zigan, R. B. Thorpe, U. Tüzün and G. G. Enstad: Experimental investigation on air current segregation in cylindrical laboratory silos, Proceedings, The 4th International Symposium Reliable Flow of Particulate Solids, June 10 – 12, 2008, Tromsø
• S. Ding, M. Jecmenica, G. G. Enstad, J. Y. Ooi and J. M. Rotter: Prediction of flow mode during silo discharge and its preliminary verification, Proceedings, The 4th International Symposium Reliable Flow of Particulate Solids, June 10 – 12, 2008, Tromsø
• R. Beck, D. Malthe-Sørenssen, J.-P. Andreassen, T. Nysæter and G. G. Enstad: Influence of crystal properties in powder flow behavior, Proceedings, The 4th International Symposium Reliable Flow of Particulate Solids, June 10 – 12, 2008, Tromsø
• G. G. Enstad: Optimization of Inserts in Silos, Bornimer Agrartechnische Berichte, Heft 65, Potsdam-Bornim 2009
• Dyrøy, A., Karlsen, M., Enstad, G.G. de Silva, S.R. (2000): Air Current Segregation: Quantification of Effects and Avoidance. 3rd Israeli Conference for Conv. & Handl. of Part. Solids, The Dead Sea, 29 Mai - 1 June. P.7, paper no. 082.
• Dyrøy, A., Karlsen, M. (2001): Process Response of Segregation - Environment and Yield in Aluminium Production. 7th International Conf. on Bulk Material, Storage Handling and Transportation, Newcastle, Australia, October 3-5. P.10.
• Karlsen, M., Dyrøy, A. (2002): Interaction Between Aluminium Process and Powder Technology. TMS Annual Meeting 2002, Seattle, USA, February 17-21. P.5.
• Karlsen, M., Dyrøy, A., Nagell, B., Enstad, G.G., Hilgraf, P. (2002): New Aerated Distribution (ADS) and Anti Segregation (ASS) Systems for Alumina. TMS Annual Meeting 2002, Seattle, USA, February 17-21. P.5.
• Dyrøy, A., Karlsen, M. (2003): Implementation of Intelligent Bulk Solids Handling in Norwegian Aluminium Industry - Some Milestones and Results. 4th Int. Conf. for Conveying & Handling of Particulate Solids, Budapest, Hungary, May 27-30. P.6.
• Ose, S., Dyrøy, A. (2003): What is Alumina? Or how Diverse can one Powder be?. 4th Int. Conf. for Conveying & Handling of Particulate Solids, Budapest, Hungary, May 27-30. P.6.
• M. Halstensen, C. Arakaki, C. Ratnayake, and B.K. Datta, Online prediction of mass flow rate of solids in dense phase pneumatic conveying systems using multiple pressure transmitters and multivariate calibration, Powder Technology 189(3) (2009) 416-421.
• A. Sæther, C. Arakaki, C. Ratnayake, and D.D. Ruscio, Mass flow prediction model for pneumatic conveying using system identification, in 4th International Symposium Reliable Flow of Particulate Solids, Relpowflo IV. 2008, Telemark University College: Tromsø, Norway.
• C. Arakaki, C. Ratnayake, B.K. Datta, and B. Lie, Study of mass flow of dextrose in pneumatic conveying, in BioPowders Mini-Conference. 2007, Research Institute of Chemical and Process Engineering, University of Pannonia: Budapest, Hungary.
• C. Arakaki, A. Ghaderi, B.K. Datta, and B. Lie, Non intrusive mass flow measurements in pneumatic transport, in The 5th International Conference for Conveying and Handling of Particulate Solids, CHoPS-05. 2006: Sorrento, Italy.
• B.K. Datta and C. Ratnayake, A simple technique for scaling up pneumatic conveying systems, Particulate Science and Technology 21(3) (2003) 227-236.
• B.K. Datta and C. Ratnayake, A possible scaling up technique for dense phase pneumatic conveying, in The 4th International Conference for Conveying and Handling of particulate solids. 2003: Budapest. p. 11.74-11.79.
• B.K. Datta, R. C., A. Saasen, and Y. Bastesen, A new design approach for pneumatic conveying, Annual Transactions of the Nordic Rheology Society 11 (2003) 57-62.
• B.K. Datta, A. Dyroy, C. Ratnayake, and M. Karlsen, Influence of fines concentration on pneumatic transport capacity of alumina, Particulate Science and Technology 21(3) (2003) 283-291.
• C. Ratnayake, A comprehensive Scaling Up Technique for Pneumatic Transport Systems, in Department of Technology. 2005, Telemark University College: Porsgrunn.
• U. Datta, Multimodal measurements in dilute phase pneumatic conveying systems. 2007, Norwegian University of Science and Technology. p. 139.