Pulsatile flow micromixing coupled with ICED for non-Newtonian fluids Mehmet Melih Tathsoz, cetin Canpolat

WOS: 000444664200002The most biofluids/polymers, which are extensively used in lab-on-a-Chip devices exhibit non-Newtonian characteristics, whose mixing behaviors become crucial for the most engineering applications. For this purpose, the present numerical study investigates the performance of pulsatile flow micromixer coupled with induced charge electro-osmosis (ICED) for non-Newtonian fluids, such as power-law and Carreau. The mixing characteristics of Newtonian fluids are also presented and compared to non-Newtonian cases. The straight micro channel geometry is modified using rectangular obstruction with various heights to increase stirring performance for non-Newtonian fluids. The magnitude of the external electric field, the frequency of pulsatile flow and the width of rectangular obstruction are systematically varied for a comprehensive parametric evaluation. Time dependent patterns of streamline and corresponding concentration maps are illustrated for qualitative presentation. Moreover, mixing index values are plotted versus obstruction width, the frequency of pulsatile flow and imposed electric field strength for quantitative analysis. It is observed that pulsatile flow with ICE) yields reasonable performance for all type of fluids. However, a rectangular obstruction is required to obtain maximum performance of mixing of non-Newtonian fluids for the given time, t = 10 s and length, l = 0.7 mm. It can be reported that rectangular obstruction has a significant effect on mixing performance for current conditions.Cukurova University Scientific Research OfficeCukurova University [FBA-2017-7960]This work is supported by Cukurova University Scientific Research Office financially under contract no FBA-2017-7960

Mechanical testing strategies for dental implants

Erkona doo Sarajevo, Bosnia and Herzegovina;et al.;Oracle Bosnia and Herzegovina;Privredna banka dd Sarajevo, Bosnia and Herzegovina;Symphony Sarajevo, Bosnia and Herzegovina;Verlab doo Sarajevo, Bosnia and HerzegovinaInternational Conference on Medical and Biological Engineering, CMBEBIH 2017 --16 March 2017 through 18 March 2017 -- --Dental implants, which are utilized for substituting missing teeth are appealed in clinical applications for decades. Moreover, they also are used for supporting craniofacial reconstructions and for orthodontic appliances. Besides having esthetically similar view to natural tooth, dental prostheses have no harmful effect to neighboring teeth and non-disturbing nature for the patient during mastication. On the other hand, the dental implant can result in bone resorption, biocompatibility problems and high costs. There are four main types of dental implant designs, which are developed and employed in clinical dentistry entitled as subperiosteal form, blade form, ramus frame, and endosseous form. From the beginning of this technic, a great evolution not only on implant design and surgical technologies of dental implants, but also on the classification of clinical success, failure and different surface treatments of dental implants is done. The failures are generally influenced on the mechanical properties of dental implants. Therefore, it is critical to estimate possible failures in a specific design of dental implant, which could protect the patients’ health and comfort. For this purpose, the experimental methods for the dental implants provide precise data for clinicians and engineers. Maximum allowable stress and strain, resonance frequency and resistance to fracture are key parameters to determine long term durability of dental implants. In this study, current status of frequently utilized mechanical tests to measure these properties, such as tensile, resonance and fracture tests are summarized. Test procedures with related standards, their strength and weaknesses are briefly discussed. This review is prepared to inform the tester about mechanical testing methods of dental implants in the light of recent advancements. © Springer Nature Singapore Pte Ltd. 2017