Person: PULAT, ERHAN
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PULAT
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ERHAN
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Publication Computational investigation of confined wall inclination effects on impinging jet fluid flow and heat transfer(Elsevier, 2021-02-05) Pulat, Erhan; Beyazoğlu, Ebubekir; PULAT, ERHAN; Beyazoğlu, EbubekirIn this study, the inclination angle effects of the confined wall on impinging jet fluid flow and heat transfer are investigated computationally. Mainly six inclination angles of confinement plate -2 degrees, 0 degrees, 2 degrees, 4 degrees, 6 degrees, and 8 degrees are considered. Flow is assumed two-dimensional, steady, incompressible, and turbulent. Jet Reynolds number is 10200. SST k-omega) turbulence model was chosen since this model is recommended in some recent studies. Conservation equations for the computational model were solved by using ANSYS-Fluent code. Flow structures are completely governed by the inclination angle, and the center of the main vortex moves to the right by increasing the inclination angle. Predictions show that the inclination angle has a great influence on flow characteristics and heat transfer in the wall jet region after the second peak. Local heat transfer increases with the increasing inclination angle of the confinement plate after X/D = 10. The cumulative increase in average Nu number from 0 degrees to 8 degrees is almost 18%.Publication Cooling of heated blocks with triangular guide protrusions simulating printed circuit boards(MDPI, 2022-12-01) Beyazoğlu, Ebubekir; Yüce, Bahadir Erman; Ateş, Murat; Yalındağ, Rümeysa; Sökmen, Kemal Furkan; Pulat, Erhan; Beyazoğlu, Ebubekir; Ateş, Murat; YALINDAĞ, RÜMEYSA; PULAT, ERHAN; Mühendislik Fakültesi; Fen Bilimleri Yüksekokulu; 0000-0002-7327-8471; 0000-0003-1065-2419; 0000-0003-2738-8917; DLL-8342-2022; AAH-1579-2021; CEZ-1292-2022There is no study that investigates triangular guide protrusions including their systematical geometrical changes together with the effects of channel height in the open literature in the context of the authors' knowledge. Moreover, the number of laminar studies is less than turbulent studies, whereas low velocity or natural convection cases are still important, especially for small devices in small PCB passages. The objective of this study is to investigate numerically the effects of triangular guide protrusions for the enhancement of heat transfer from the blocks' simulated electronic components in laminar flow conditions. Two-dimensional, incompressible, steady, and laminar flow analysis was performed to predict fluid flow and heat transfer characteristics for three heated blocks in a PCB (printed circuit board) passage with triangular guide protrusions mounted on the upper wall. The Galerkin finite element method of weighted residuals was used to discretize conservation equations. The effects of the channel expansion ratio and inlet velocity were investigated for five geometrical cases. If the size of the protrusions is increased, the existence of protrusions starts to affect the flow patterns on the lower wall. The size of the last protrusion controls the flow structure downstream of the last block. On the upper wall, after the last protrusion, a recirculation is formed and the length of the recirculation increases with an increasing Re number. Moreover, the reattachment length of recirculation after the last block increases with an increasing Reynolds number for a fixed expansion ratio. Expansion ratio and inflow conditions caused by blocks and protrusions have a great influence on the formation of secondary recirculation in addition to the Reynolds number. Heat transfer increases with increasing sizes of upper triangular protrusions. Maximum overall heat transfer enhancement is provided as 47.7% with the geometry of the maximum sized protrusions for the channel height of 3 h. In the case of 4 h, the maximum overall heat transfer enhancement is 24.21%. These enhancements in heat transfer that can be encountered in PCB cooling applications may help the PCB cooling designers.Publication Modelling and simulation of a single-zone heating and ventilation system(Pamukkale Univ, 2005-01-01) ŞENGİRGİN, MESUT; Şengirgin, Mesut; PULAT, ERHAN; Pulat, Erhan; Mühendislik Fakültesi; Makine Mühendisliği BölümüIn this study, modelling and simulation results of a single-zone heating and ventilation system of a large office room are introduced. Heating system is controlled by an on-off controller. By considering the sinusoidal outdoor air tempareture variation and various outdoor/return air ratios as input parameters, dynamic behaviour of room air tempereture are investigated. For this purpose, MATLAB/Simulink code is used.Publication A parametric study on the effect of blowing parameters of split-type air conditioners on thermal comfort and ventilation(Begell House, 2021-01-01) Yuce, Bahadır Erman; Pulat Erhan; PULAT, ERHAN; Mühendislik Fakültesi; 0000-0002-2432-964X; AAH-7816-2021In this study, air distribution, indoor air quality based on carbon dioxide, and thermal comfort are investigated numerically by using a breathing thermal manikin model in an office room that is heated by a split-type air conditioner. The effect of ventilation parameters like inlet temperature and inlet velocity on thermal comfort and CO2 removal is also examined. Measurements of one of the faculty member offices of Bursa Uludag University (Faculty of Engineering, Department of Mechanical Engineering) are used for office room geometry. The airflow in the room is considered threedimensional, transient, turbulent, multiphase, and compressible. The standard k-epsilon turbulence model is used with scalable wall function. According to the results of this study, the average temperature difference between the warmest and coolest cases is lower than the difference in the blowing temperatures of these cases. Also, according to predicted mean vote (PMV) results, despite different inlet velocities and temperatures, the same comfort levels can be obtained in different cases. Different amounts of CO2 values were also obtained in all cases and it is considered that there is no obvious pattern between examined blowing parameters with CO2 amount in the room.Publication Led junction and heatsink number calculation with computational fluids dynamic (CFD)(Türk Isı Bilimleri Teknolojisi, 2015-01-01) Sökmen, K. Furkan; Pulat, Erhan; Yamankaradeniz, Nurettin; Coşkun, Salih; PULAT, ERHAN; YAMANKARADENİZ, NURETTİN; COŞKUN, SALİH; AAA-1753-2021; DLL-8342-2022; CMA-0559-2022A LED (Light Emmitting Diode) is an optoelectronic component which includes active layer among N and P type semiconductor products like a sandwich and electrical taps. Since 1995 LED is used in automotive sector. On this application, 0.5-0.75-1-1.25 W powered a typical car head light LED's junction temperature (T-j) rates with HAD resolutions at 25, 50, 80 degrees C and heat transmission rates are calculated. The winglet numbers and types, optimum winglet gaps were found out with macro according to evidences. The geometric model of LED was designed by CATIA V5 R19 software. It is divided into its components with ICEM CFD and its temperature analysis is done via ANSYS CFX 14. Its airflow is assumed as in constant regime, laminar and solid. Thermo physical features of the weather's changes related to heat, buoyancy and radiation effects are taken into consideration. Heat transmission rate on circuit and temperature rates are calculated and compared with the literature rates. Appropriate fin design developed with the help of program developed and despite the increasing ambient temperature, junction temperatures taken appropriate values. Optimum fin interval was found to be an important parameter in the design of heat sinks. LED should be located where the ambient temperature is low in headlamp for LED life and performance to be expected level.Publication Modelling and simulation of a single-zone heating and ventilation system(Pamukkale Univ, 2005-01-01) Şengirgin, Mesut; ŞENGİRGİN, MESUT; Pulat, Erhan; PULAT, ERHANIn this study, modelling and simulation results of a single-zone heating and ventilation system of a large office room are introduced. Heating system is controlled by an on-off controller. By considering the sinusoidal outdoor air tempareture variation and various outdoor/return air ratios as input parameters, dynamic behaviour of room air tempereture are investigated. For this purpose, MATLAB/Simulink code is used.