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Investigation of Heat Transfer Augmentation between the Ribbed Plates via Taguchi Approach and Computational Fluid Dynamics

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Journal of Thermal Science 2020年第3期29卷 647-666页

作者： GOKTEPELI Ilker ATMACA Ulas cakan abdullah Department of Mechanical Engineering Faculty of Engineering and Natural SciencesKonya Technical UniversityKonya 42075Turkey

Heat transfer and turbulent flow characteristics between the ribbed plates have been numerically studied in the present *** ribs with the rectangular cross-section have been placed on the top and the bottom plates of the duct,*** is assumed that the fluid at 300 K has entered the system while the walls kept at 400 *** numerical analyses have been performed by k-ωShear Stress Transport(SST)turbulence model for Re=10000,15000 and *** the fixed rib width,the dimensionless height and the dimensionless spacing have been respectively varied as 0.1≤h’≤0.3 and 0.5≤S’≤1,and the results have been compared with the ones of the smooth *** though there are twenty-seven cases obtained as a result of parametric combinations,the number of various cases has been reduced from twenty-seven to only nine different variations by applying the Taguchi ***,the effects of all the considered parameters on the heat transfer and flow characteristics have been determined in terms of the influence *** optimum parameters for Nusselt number and pressure loss have been ascertained *** is more,the almost exact values for Nusselt number and pressure loss have also been attained by the confirmation test having an error percentage of 6%.The most dominant factor has been determined as the rib height due to its effect on both heat transfer and flow ***,with respect to the numerical results,increasing the rib height,the rib spacing and Reynolds number has separately increased Nusselt ***,symmetrical flow structure has been disturbed as a result of ascending the rib height as clearly seen for h’=0.3 from the *** the meantime,pressure loss has been augmented owing to the increment of the geometrical parameters and also Reynolds number.h’=0.1 with S’=0.5 at Re=10000,h’=0.2 with S’=0.5 at Re=15000 and h’=0.1 with S’=0.75 at Re=15000 can be suggested for the heat transfer enhancement since the press

关键词： CFD heat transfer Nusselt number parallel plate Reynolds number rib Taguchi approach turbulent flow

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On Some New Paranormed Euler Sequence Spaces and Euler Core

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Acta Mathematica Sinica,English Series 2010年第7期26卷 1207-1222页

作者： Serkan DEMIRIZ Celal cakan Gaziosmanpasa University Faculty of Arts and Science Department of Mathematics Department of Mathematics InnUniversityFaculty of Education

In this paper, the sequence spaces e0^τ（u, p） and ec^τ（u, p） of non-absolute type which are the generalization of the Maddox sequence spaces have been introduced and it is proved that the spaces e0^τ（u,p） and ec^τ（u,p） are linearly isomorphic to spaces co（p） and c（p）, respectively. Furthermore, the α-, β- and γ-duals of the spaces 0^τ（u,p） and ec^τ（u,p） have been computed and their bases have been constructed and some topological properties of these spaces have been investigated. Besides this, the class of matrices （e0^τ）（u, p）： μ） has been characterized, where μ is one of the sequence spaces l∞, c and co and derives the other characterizations for the special cases of μ. In the last section, Euler Core of a complex-valued sequence has been introduced, and we prove some inclusion theorems related to this new type of core.

关键词： sequence spaces matrix transformations core of a sequence

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On Deformed Riemannian Extensions Associated with Twin Norden Metrics

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Chinese Annals of Mathematics,Series B 2015年第3期36卷 345-354页

作者： Arif SALIMOV Rabia cakan Department of Mathematics Ataturk University

The main purpose of this paper is to study the deformed Riemannian extension▽g +VG··in the cotangent bundle, where G is a twin Norden metric on the base manifold.

关键词： Riemannian extension Cotangent bundle Vertical and complete lifts Horizontal lifts Deformed metric Twin Norden metric

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Musical Isomorphisms and Problems of Lifts

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Chinese Annals of Mathematics,Series B 2016年第3期37卷 323-330页

作者： Rabia cakan Kursat AKBULUT Arif SALIMOV Department of Mathematics Ataturk University Azerbaijan National Academy of Sciences Institute of Mathematics and Mechanics

Using the complete lift on tangent bundles, the authors construct the complete lift on cotangent bundles of tensor fields with the aid of a musical isomorphism. In this new framework, the authors have a new intrepreta... 详细信息

关键词： Tensor fields Cotangent bundles Complete lift Anti-Hermitian metric Riemannian extension

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Rebar Impalement Injury Throughout Bilateral Hemithorax and Pericardium

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Open Journal of Thoracic Surgery 2015年第3期5卷 31-34页

作者： Tevfik Ilker Akcam Ayse Gul Ergonul Ali Ozdil Alpaslan cakan Ufuk Cagirici Dr.Suat Seren Chest Disease and Thoracic Surgery Training and Research Hospital Department of Thoracic SurgeryIzmirTurkey Ege Universıty Faculty of MedıcıneDepartment of Thoracıc SurgeryIzmirTurkey

Thoracic traumas have an important place among all injuries as they can cause significant mortality and morbidity. The thoracic injuries are the large part of trauma with head and extremity injuries. Thoracic traumas are divided into two groups, including penetrating and blunt. The primary causes for penetrating traumas are wounds caused by gunshot and sharp objects. The lungs are the most injured organ in penetrating thoracic traumas with many organ injuries accompanied. This case report is about a rebar impalement into bilateral hemitoraces and pericardium after falling down in spite of any injury is not occurred in heart, lung and great vessels. The fact that an injury to such an extent does not cause any intrathoracic catastrophic event is something that has not been reported in the past.

关键词： Rebar Injury Hemithoraces Pericardium

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Clinical Approach for the Pneumomediastinum after Blunt Chest Trauma

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Open Journal of Thoracic Surgery 2017年第1期7卷 8-13页

作者： Onder Kavurmaci Tevfik Ilker Akcam Ali Ozdil Ayse Gul Ergonul Kutsal Turhan Alpaslan cakan Ufuk Cagirici Department of Thoracic Surgery School of Medicine Ege University Izmir Turkey

Objective: Pneumomediastinum (PM) can be observed after blunt and penetrating chest trauma. Most of the patients with PM due to trauma can be managed conservatively. This study aimed to evaluate the cases with PM on thorax computed tomography (CT) after blunt chest trauma (BCT). Methods: Medical records of patients with PM due to BCT between January 2000 and December 2014 were reviewed retrospectively. Thorax CT was used to verify pneumomediastinum in all patients. Twenty-four patients which had different causes of PM (penetrating trauma, iatrogenic, spontaneous) were excluded from the study. Data of sixty-nine patients with the diagnosis of PM secondary to BCT and who were observed without any further procedure for the cause of PM, were evaluated retrospectively. Results: There were 59 male and 10 female patients with the mean age of 47.60 ± 17.47 years (range, 16 to 80 years). The most common cause of PM etiology was traffic accident with a rate of 38 (55.06%) patients, followed by fall from height in 25 (36.24%), compression in 3 (4.35%) and drubbing in 3 (4.35%) patients. There was a 12.46 ± 6.42 days (range, 6 to 28 days) mean duration of chest tube drainage which was performed for accompanying pathologies like pneumothorax and hemothorax. No complication was determined for short and long term follow-up of patients when all hospital records were analyzed in terms of complication. Conclusions: PM after BCT may be a marker of esophageal and tracheobronchial injury and invasive procedures like bronchoscopy and endoscopy can be needed for differential diagnosis. We evaluated 69 patients in good general status and no need for intensive care management with PM in this study and observed them without any further procedure. As a result of these findings we concluded that for the PM patients after BCT with uneventful clinical course, conservative treatment without any further procedure is a safe and sufficient method.

关键词： Pneumomediastinum Blunt Chest Trauma

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The Effect of Preoperative AchR-Ab Level to the Prognosis in Operated Myasthenia Gravis Patients

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Open Journal of Thoracic Surgery 2017年第4期7卷 62-69页

作者： Tevfik Ilker Akcam Ali Ozdil Onder Kavurmaci Ayse Gul Ergonul Kutsal Turhan Alpaslan cakan Ufuk Cagirici Ayse Nur Yuceyar Department of Thoracic Surgery School of Medicine Ege University Izmir Turkey Department of Neurology School of Medicine Ege University Izmir Turkey

Objective: Seropositive myasthenia gravis (MG) depends on the presence of acetylcholine receptor antibodies (AchR-Ab) against nicotinic acetylcholine receptors at the postsynaptic neuromuscular junction. In this study, we investigated the effect of AchR-Ab levels to symptoms and treatment in the MG patients underwent surgery for thymic pathology. Materilas and Methods: The records including level of preoperative AchR-Ab, type of thymic pathology, the changes of symptoms and treatment after surgery for thymic pathology of 37 MG patients between January 2007 and December 2015 have been viewed retrospectively. Results: The mean age of 37 patients (21 females, 16 males) was 40.2 ± 14.9 years (range, 18 to 75 years). The mean of the level of AchR-Ab was 144.7 ± 427.6 nmol/L (range, 0.1 to 1806 nmol/L). In the patient group including the reduced use of anticholinesterase after surgery the mean of level of AchR-Ab was 241.3 nmol/L while it was 10.8 nmol/L in the patient group including the non-reduced use of anticholinesterase (p = 0.082) after a mean follow-up period of 23 months postoperatively. The mean levels were 246.7 nmol/L and 8.5 nmol/L for the reduced and non-reduced use of corticosteroid patient groups, respectively (p = 0.001). In the 25 patients with fewer symptom after surgery the mean of the AchR-Ab level was 205.3 nmol/L while it was 18.3 nmol/L in the patients without any changes (p = 0.071). Conclusion: We concluded that the preoperative level of AchR-Ab was associated with postoperative dosage of anticholinesterase and corticosteroids and severity of symptoms postoperatively. We think that the levels of AchR-Ab titers can be a marker for the efficacy of thymic surgery.

关键词： AchR-Ab Myasthenia Gravis Thymectomy

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