Ram makinesinde kurutma prosesinin enerji verimliliği analizi

Tekstil sektöründe ram makineleri, kumaşların makine içerisinde enine bir şekilde paletler tarafındantutturulduğu, bir çift yürüyen zincirle kumaşın hareketinin sağlandığı ve bu esnada kumaşa sıcak havanıngönderildiği kurutma makineleridir. Bu çalışmada, 10 kabinli bir ram makinesinin kurutma prosesinde, enerjiverimliliğini arttırmak hedeflenerek, gerçek üretim şartlarında deneysel çalışma yapılmıştır. Deneyler üçfarklı kurutma havası sıcaklığında (110 – 130 – 150 o C ) ve 10 m/d kumaş ilerleme hızında, %95 pamuk +%5likra içerikli kumaş kullanılarak gerçekleştirilmiştir. Deneylerden elde edilen verilerden yararlanılarak, herkabinde gerçekleşen ısı-kütle transfer katsayıları, buharlaşma miktarı, taşınım yolu ile kumaşa aktarılan enerjihesaplanmıştır. Yapılan çalışmada; kurutma havası sıcaklığı 110 o C’den 130 o C’ye çıkarıldığında, ısı transferkatsayısı yaklaşık %6 artarken, enerji veriminde %4 azalma, kurutma havası sıcaklığı 130 o C’den 150 o C’yeçıkarıldığında, ısı transfer katsayısı yaklaşık %26 artarken enerji veriminin %5 azaldığı sonuçlarınaulaşılmıştır

Aigai (Aeolis), Türkei. Bauforschung am hellenistischen Marktbau. Die Arbeiten des Jahres 2021

The agora building at Aigai is a well-known Hellenistic structure. After its first documentation in 1886 by a German team led by Richard Bohn, it became a reference for multi-storeyed agora buildings in Western Anatolia. However, the building was never fully documented and studied in detail. This ­contribution presents the preliminary results of a new project that started in 2021 aiming to fill this gap with a thorough building archaeological study. workflow that ensures the quality of a 3D model is presented

Experimental examination and theoretical modeling of drying behavior in the ram machine

In this study, drying behavior of a ram machine, basically used for drying of textile products with hot air, was experimentally examined and the drying behavior was theoretically modeled by the first order kinetic model derived from Fick's second law. The experimental study was carried out under real conditions in a 10-chamber ram machine. The experiments were carried out at three different drying air temperatures (110-130-150 degrees C) and three different fabrics feed rates (0.167-0.333-0.500 m/s) by using 95% cotton + 5% lycra content fabric. By utilizing the data obtained from the experiments, the evaporation amount, the non-dimensional humidity ratios, the heat and mass transfer coefficients and energy efficiency analysis occurring in each cabin were calculated. It was observed that the R-2 values varied from 0.9945 to 0.9994 by comparing the model and experimental data with the help of regression analysis. According to the values obtained from the experimental conditions, when the drying air temperature was increased from 110 degrees C to 130 degrees C, the heat convection coefficient increased by about 15-23% while the energy efficiency decreased by about 4%. In the same way, when the drying air temperature was increased from 130 degrees C to 150 degrees C, the heat convection coefficient increased by about 20-30% while the energy efficiency decreased by about 5%. In addition, it was concluded that the use of the first order kinetic model as a drying model in the ram machine was considerably suitable. With the presented results, both academic researchers and industrial researchers will be able to find explanatory ideas on the drying behavior of dried fabrics in the ram machines

Determination of Drying Behaviour in Industrial Type Convectional Dryer and Mathematical Modelling

In this study, the performance of a stenter (ram machine) that enables the drying of textile products with hot air is theoretically modelled with a diffusion model derived from Fick's second law. The experimental study was conducted in a 10 chamber stenter with three different drying temperatures (110-130-150 degrees C) and three different fabric speeds (10-20-30 m per minute.) by using a fabric consisting of 95% cotton + 5% lycra. The drying behaviour of the dryer was determined by utilizing the data obtained from the studies. With the help of the utilized model, the values of diffusion coefficients and activation energies were obtained, the conformity of data between the model and the experimental studies were compared by using regression analysis, it was observed that the R-2 value varied between 0.9812 and 0.9961

Cerebral proliferative angiopathy accompanied by cerebral cavernous malformation: A case report

Cerebral Proliferative Angiopathy (CPA) is a rare vascular malformation that is distinguished from classical brain arteriovenous malformations (AVM) in its imaging findings and clinical progression but more importantly in its pathophysiology. Here we report the case of a 37-year-old male patient with CPA accompanied by Cerebral Cavernous Malformation (CCM) in hopes to expand the inquiry into the pathophysiology of this rare lesion. A patient with progressive headache, right-sided weakness, and impaired speech were evaluated at our medical center. Neuroimaging studies were performed, and the patient was diagnosed with CPA. The patient has been followed up with conservative management and periodic neuroradiological evaluation for 5 years. Digital subtraction angiography (DSA) showed a vascular malformation diffusely covering the left hemisphere that is consistent with CPA. In addition, 2 sequential CCMs were detected in the right hemisphere. Also, the patients’ familial history included two brothers with CCMs. The coexistence of CPA with CCM and patients’ familial history of CCM could suggest the possibility of a common pathophysiological element