green fig, which is usually consumed as dry fruit, is one of the important non-oil export agricultural commodities of iran. in this study, some important physical properties of green figs including geometric mean diamter, sphericity, porosity, particle and bulk density and pressure drop across a thin bed were measured at constant moisture content of 6% (dry basis). air flow ranges used in this ...

Crumb rubber media have been beneficially invented for ballast water and tertiary wastewater treatment. There is a critical need for precise prediction of clean-bed head loss for engineering design purposes. Pilot crumb rubber filters were tested to study their clean-bed head loss under the influences of three design and operational parameters media size, media depth, and filtration rate . Data...

Sintered metal porous media currently plays an important role in air bearing systems. When flowing through porous media, the flow properties are generally represented by incompressible Darcy-Forchheimer regime or Ergun regime. In this study, a modified Ergun equation, which includes air compressibility effects, is developed to describe friction characteristic. Experimental and theoretical inves...

1935 yılında İstanbul’da doğdu. Vefa Lisesini bitirdikten sonra, İstanbul Hukuk Fakültesinde okudu (1953-1957). 1957 Fakültesi’nden mezun oldu ve aynı yıl Prof. Dr. Bülent Davran’ın kürsüsüne asistan olarak girdi. Fakültesi’nde konuk öğretim üyesi bulunan Profesör Alfred F. Conard’ın (University of Michigan, School Law, 1957-1958) E. Allan Farnsworth’la (Columbia University Law School) çalıştı....

A three-dimensional numerical model is proposed to determine the pressure drops in porous media consisting of obstacles of different sizes. A series of full three-dimensional numerical calculations were performed to reveal complex three-dimensional velocity and pressure fields within three-dimensional porous structures consisting of spheres of different sizes. These numerical results are proces...

The small open area available at the slots of underdrains in pressurized granular bed filters for drip irrigation implies: (1) existence a region with non-uniform flow, and (2) local values modified particle Reynolds number >500. These flow conditions may disagree those accepted as valid common pressure drop-flow rate correlations proposed packed beds. Here, we carried out detailed computati...

Changes in fluidization behaviour of green peas particulates with change in moisture content during drying were investigated using a fluidized bed dryer. All drying experiments were conducted at 50 + 2 0C and 13 + 2 % RH using a heat pump dehumidifier system. Fluidization experiments were undertaken for the bedheights of 100, 80, 60 and 40 mm and at 10 moisture content levels. Fluidization beha...

The ventilation resistance of air flow through rice grain layers is one the key parameters affecting drying uniformity as well energy consumption process. In order to reveal variation characteristics with paddy moisture content, velocity and bed layer depth are needed. A second model was fitted pressure drop using response surface methodology results compared those Ergun model. showed that incr...

Nagihan UĞURLU*, Fatma YÜLEK, Şule Berk ERGUN, Mehmet Doğan AŞIK, Semra IŞIKOĞLU, Emine AKÇAY Department of Ophthalmology, Ankara Atatürk Training and Research Hospital, Yıldırım Beyazıt University, Ankara, Turkey Department of Nanotechnology and Nanomedicine, Institute of Science, Hacettepe University, Ankara, Turkey Department of Biochemistry, Ankara Atatürk Training and Research Hospital, Yı...