Analysis of absorption of gases on bidisperse porous catalysts by a pulse-response technique.

Ercan, Cemal


Analysis of Field-Effect Passivation in Textured and Undiffused Silicon Surfaces
Turkay, Deniz; Koroglu, Cagil; Yerci, Selçuk (2019-09-13)
In this work, we present a numerical analysis comparing the field-effect passivation provided by fixed dielectric charges on planar and textured undiffused silicon surfaces. We focus particularly on the ratio of effective surface recombination velocities (S-eff) of planar and textured surfaces (sigma=S-eff,S-textured/S-eff,S-planar) utilizing the same fixed dielectric charge density (Q(f)) under the same injection conditions. To ensure a difference between the space-charge region profiles of textured and pl...
Analysis of temperature-dependent forward and leakage conduction mechanisms in organic thin film heterojunction diode with fluorine-based PCBM blend
Yildiz, D. E.; Gullu, H. H.; Toppare, Levent Kamil; Çırpan, Ali (Springer Science and Business Media LLC, 2020-09-01)
The forward and reversed biased current-voltage behaviors of the organic diode were detailed in a wide range of temperatures. In this diode, a donor-acceptor-conjugated copolymer system was constructed with poly((9,9-dioctylfluorene)-2,7-diyl-(2-dodecyl-benzo[1,2,3]triazole)) as a partner of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). Two-order of magnitude rectification ratio was achieved, and the temperature-dependent values of saturation current, zero-bias barrier height, and ideality factor were ...
Analysis of Transient Laminar Forced Convection of Nanofluids in Circular Channels
Sert, İsmail Ozan; Sezer Uzol, Nilay; Güvenç Yazıcıoğlu, Almıla; Kakaç, Sadık (2012-11-15)
In this study, forced convection heat transfer Characteristics of nanofluids are investigated by numerical analysis of incompressible transient laminar flow in a circular duct under step change in wall temperature and wall heat flux. The thermal responses of the system are obtained by solving energy equation under both transient and steady-state conditions for hydrodynamically fully developed flow. In the analyses, temperature dependent thermo-physical properties are also considered. In the numerical analys...
CABBAR, C; DOGU, G; Doğu, Timur; MCCOY, BJ; SMITH, JM (American Chemical Society (ACS), 1994-07-01)
The single-pellet moment technique was shown to be a powerful method for investigating the diffusion and adsorption of volatile hydrocarbons in the soil. The technique was used to evaluate effective diffusivities, adsorption equilibrium, and rate constants of chlorinated hydrocarbons (monochloroethane, 1,2-dichloroethane, 1,1,1-trichloroethane, and 1,1,2-trichloroethane). Results obtained in a dry system showed that adsorption rate constants of all these hydrocarbons on the soil pellet used are of the same ...
Analysis of velocity profiles in concentrated solid-liquid mixtures using ultrasound doppler velocimetry
Taşkın, Ahmet Fırat; Ayrancı Tansık, İnci; Uludağ, Yusuf; Department of Chemical Engineering (2021-7)
Stirred tanks are widely used for a variety of processes in industry such as solid dispersion, crystallization and dissolution processes. Several parameters are used to optimize these stirred tank processes such as impeller type, tank geometry and impeller speed. The flow field in the stirred tank is complex and varies depending on these parameters. In these processes diffusion and chemical reaction rate depend on the flow field and velocity fluctuations; therefore, information about the flow field is valua...
Citation Formats
C. Ercan, “Analysis of absorption of gases on bidisperse porous catalysts by a pulse-response technique.,” Middle East Technical University, 1980.