Browsing by Author "Ozdemir, Mustafa"

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Experimental Study on Laminar Air Flow and Heat Transfer Through a Spiral Channel Filled With Steel Balls
(Elsevier France-editions Scientifiques Medicales Elsevier, 2022) Gokaslan, Mustafa Yasin; Ozdemir, Mustafa; Kuddusi, Lutfullah
The demand in the industry for high heat transfer performance is increasing. Studies have been greatly carried out on the new emerging technologies and creating new arrangements in engineering design. Porous media or curved channel increases heat transfer. Studies have been carried out for many years in heat transfer in curved channels and porous media separately. However, in this study, the heat transfer in the case of both curved and porous media is investigated experimentally. The experiments are conducted at constant heat flux in laminar airflow regime. A total of 169 sets of experiments are carried out in 8 experimental groups, in two different radii of curvature, in the unfilled spiral channel and in spiral packed bed formed by locating 3 different ball diameters (2.00, 2.38 and 3.17 mm). Nusselt number (Nu) correlations are presented separately for both the inner surface, the outer surface and taking the average of the inner and outer surface temperatures in unfilled spiral channel. Nusselt numbers (Nu(i), Nu(o), Nu(a)) for inner surface, outer surface and the average of the inner and outer surface temperature are obtained as Nu(i) = 0.93De(0.45), Nu(o) = 0.50De(0.58), Nu(a) = 1.16De(0.44) respectively. Heat transfer in spiral packed beds has not been investigated or reported in the available literature. By defining a modified Dean number (De(m)) to reveal the effect of curvature in spiral packed beds, a correlation between the modified Dean number (De(m)) and the Nusselt number (Nu(p)) based on ball diameter is given. Nusselt number for spiral packed beds are presented as Nu(p) = 0.19De(m)(0.81). This correlation is also suitable for straight packed beds when the curvature ratio is neglected.
Ovine ENSOARG00020011332 rs427117280-GG Provides an Increase in Weaning Weight and Average Daily Gain Until Weaning Weight in a Multi-Breed Sheep Population
(Copernicus Gesellschaft Mbh, 2025) Akyuz, Bilal; Daldaban, Fadime; Ozdemir, Mustafa; Karakus, Ferda; Bayram, Davut; Yagci, Serdar; Cinar, Mehmet Ulas
Lamb meat, which is consumed as widely as pork, beef and poultry, has a very important place in red-meat consumption worldwide. Sheep can survive without consuming green fodder in geographies with poor pastures and very harsh continental climate conditions. In lambs reared for meat purposes, the average daily weight gain (ADG) from birth to weaning and their live weight at weaning are crucial economic traits that affect the profitability of breeders. Additionally, lamb live weight at weaning age could be vital for the lamb's subsequent live weight gain and survival rate. Therefore, improving the live weight at weaning age is desired to increase lamb meat production. However, information on animals' genetic background that affects the weaning weight is limited in many sheep breeds. The aim of this study was to investigate the association of the rs427117280 single nucleotide polymorphism (SNP) on chromosome 2 (OAR2) with live weight gain at different time points (live weight at birth and on the 30th, 60th and 90th days post-birth) in indigenous sheep breeds (Akkaraman, & Scedil;avak Akkaraman, Morkaraman, Karayaka and & Idot;vesi) in T & uuml;rkiye. In total, 1973 lambs were genotyped using Custom TaqMan SNP genotyping assays for the rs427117280 SNP. Association analysis showed that lambs with a GG genotype had the highest weight on the 90th day (BW90) and the highest ADG from birth to the 90th day (ADGB-90) (P <= 0.01). It was concluded that rs427117280 could be considered as a candidate quantitative trait nucleotide (QTN) for the BW90 and ADGB-90 traits. Therefore, these findings suggested that variation in the rs427117280 SNP might be used as novel genetic marker for improving pre-weaning and weaning growth traits in sheep.