Modeling of evaporation from a sessile constant shape droplet

In this study, a computational model for the evaporation from a sessile liquid droplet fed from the center to keep the diameter of the droplet constant is presented. The continuity, momentum and energy equations are solved with temperature dependent thermo-physical properties using COMSOL Multi-physics. At the surface of the droplet, convective heat and evaporative mass fluxes are assigned. Since the flow field is affected by evaporative flux, an iterative scheme is built and the computation is automated using COMSOL-MATLAB interface. Correlations are implemented to predict the convective heat transfer coefficients and evaporative flux. Three different wall temperatures are used in simulations. The results show that the flow inside the droplet is dominated by buoyancy when the effect of the thermo-capillarity is neglected. The resulting flow generates a circulation pattern emerging from the entrance to the apex, along the surface of the droplet to the bottom heated wall and back to the entrance. © 2017 ASME The American Society of Mechanical Engineers

Two-dimensional computational modeling of thin film evaporation

A considerable amount of the evaporation originates from the close vicinity the three-phase contact line in an evaporating extended meniscus due to the low thermal resistance across the ultra thin film. Evaporation taking place within the thin film region is commonly modeled using the uni-directional flow assumption of the liquid following the lubrication approximation. Although the uni-directional flow based models may yield practically reasonable results in terms of the cumulative quantities such as total evaporation rate, the underlying physics of the problem cannot be explained solely by uni-directional flow, especially when the dominant transverse liquid motion is considered near the close proximity of the contact line. The present study develops a solution methodology to enable the solution of steady, incompressible, 2-D conservation of mass and linear momentum equations for the liquid flow in an evaporating thin film. Solution methodology includes the coupling of an uni-directional solver with high precision numerics, a higher order bi-directional spectral element solver and a finite element solver. The novelty of the present study is that steady, 2-D conservation of mass and linear momentum equations are considered in the modeling of thin film evaporation without the exclusion of any terms in the conservation equations. © 2017 Elsevier Masson SA

L-shell differential cross-section and alignment of uranium at 59.54-keV photon energy

L X-ray differential cross-sections of uranium were calculated at several polar scattering angles (85°, 95°, 105°, 115°, 125°, and 135°) at 59.54-keV photon energy by using a Si(Li) detector. We observed that Ll and L? X-rays were dependent on the polar scattering angle, whereas L? and L? X-rays were independent of the polar scattering angle. Therefore, the anisotropy parameters for Ll and L? X-rays were obtained using the intensity ratios of Ll to L? X-rays and of L? to L? X-rays to reduce some systematic errors. © 2017 Elsevier Lt

Production of scalar and vector bileptons in polarized e(-)gamma and gamma gamma colliders

Bu çalışma,06-09 Eylül 2016 tarihlerinde Bodrum[Türkiye]’de düzenlenen 32. International Physics Congress of Turkish-Physical-Society (TPS) Kongresi‘nde bildiri olarak sunulmuştur.We study the production of doubly charged scalar and vector bileptons which are predicted several beyond the Standard Model scenarios, in polarized high energy e gamma and gamma gamma collisions with the photon originating from Compton backscattering. We analyze the discovery potential and show how the use of polarized beams is to distinguish between scalar and vector bileptons in model-independent framework.Türk Fizik Derneğ

Light Higgs bosons and muon g-2 in THDM

Bu çalışma, 06-09, Eylül 2016 tarihlerinde Bodrum[Türkiye]’de düzenlenen 32. International Physics Congress of Turkish-Physical-Society (TPS) Kongresi‘nde bildiri olarak sunulmuştur.As well as having a significant impact on models beyond the Standard Model, the Higgs boson discovery has opened a new era in both experimental and phenomenological searches. For instance, observed anomalies in Higgs decays into two photons and four leptons and muon anomalous magnetic moment (muon g - 2) may imply more Higgs-like scalars. In this work, we study Two Higgs Doublet Model-TypeIII, in which one Higgs doublet develops a zero vacuum expectation value. we find the mass spectrum include five Higgs bosons each of which is lighter than about 350 GeV. We consider the contributions to muon g - 2 from these light extra Higgs bosons, and we find that the discrepancy between the SM and the experimental measurements can be resolved if m(H), m(A), m(H perpendicular to) less than or similar to 150 GeV.Türk Fizik Derneğ

Detector design studies for Turkish accelerator center

Bu çalışma, 06-09, Eylül 2016 tarihlerinde Bodrum[Türkiye]’de düzenlenen 32. International Physics Congress of Turkish-Physical-Society (TPS) Kongresi‘nde bildiri olarak sunulmuştur.The proposed Particle Factory detector at Turkish Accelerator Center (TAC-PF) aims to search for charm physics, CP violation and mixing of D-0 mesons as well as new physics effects by investigating head-on collisions of 1 GeV electron from Energy Recovery Linac (ERL) with 3.56 GeV positrons from synchrotron storage ring. In this work, we constructed the TAC-PF detector design by using a recently developed framework namely Detector Description for High Energy Physics (DD4hep). The baseline TAC-PF detector design and its qualifications were summarized, followed by a general description.Türk Fizik Derneğ