After completing most of his primary and secondary education in Germany, he graduated from secondary school in Turkey. He obtained his BSc in Mechanical Engineering from Gazi University in 1988. He became research assistant in the same department in 1989 and completed his MSc thesis in 1991. He earned his PhD degree in 1996 from the University of Strathclyde, England. He became Assistant Professor in 1997 and has been appointed as Associate Professor in 1999. Finally he became Full Professor in 2005. Some of his areas of research interest are: electronik cooling, combustion technologies and systems, ventilation by convection, fluid jets, application of numerical methods to energy systems, heat and mass transfer as well as problems of fluid mechanics, and similar numerical and experimental research areas.
Bu calismada, surekli sartlarda isitilan bir hacimde meydana gelen laminer dogal konveksiyonla is... more Bu calismada, surekli sartlarda isitilan bir hacimde meydana gelen laminer dogal konveksiyonla isi transferi, ustten acik konumda, farkli isi akilarinda (q), farkli aciklik oranlarinda (AO), farkli egim acilarinda (EA) ve farkli geometrik oranlarda (GO) ele alinarak, hesaplamali akiskanlar dinamigi (HAD) yontemi kullanilarak incelenmistir. Isitilan hacmin bir kenarina sabit isi akisi uygulanmis, diger butun kenarlari yalitilmistir. Problem iki boyutlu olarak ele alinmis, kutle, momentum ve enerjinin korunumunu temsil eden denklemler, uygun sinir sartlari kullanilarak sayisal olarak cozulmustur. Elde edilen sonuclara gore aciklik oraninin artmasi ve bununla birlikte egim acisinin azalmasi ile ortalama Nusselt sayisinin arttigi (NuHort.), ortalama yuzey sicakliginin azaldigi gorulmustur.
Thermal control of electronic components is a continuously emerging problem as power loads keep i... more Thermal control of electronic components is a continuously emerging problem as power loads keep increasing. The present study is mainly focused on experimental and numerical investigation of impinging jet cooling of 18 (3 × 6 array) flash mounted electronic components under a constant heat flux condition inside a rectangular channel in which air, following impingement, is forced to exit in a single direction along the channel formed by the jet orifice plate and impingement plate. Copper blocks represent heat dissipating electronic components. Inlet flow velocities to the channel were measured by using a Laser Doppler Anemometer (LDA) system. Flow field observations were performed using a Particle Image Velocimetry (PIV) and thermocouples were used for temperature measurements. Experiments and simulations were conducted for Re = 4000 – 8000 at fixed value of H = 10 × Dh . Flow field results were presented and heat transfer results were interpreted using the flow measurement observati...
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 1996
Natural convection ventilation of a rectangular chamber containing a heated rectangular body has ... more Natural convection ventilation of a rectangular chamber containing a heated rectangular body has been investigated both experimentally and computationally. The heated square blockage within the partial enclosure was adjacent to the adiabatic lower surface of the chamber and the three exposed surfaces of the block were such as to give a constant heat flux. The air inlet and outlet were located at the bottom and top of the chamber vertical walls respectively, and were of equal area. Velocity measurements were performed using laser Doppler anemometry (LDA) with a one-component He–Ne laser connected to a burst spectrum analyser (BSA). Detailed velocity profiles were measured at the inlet, outlet and at several locations inside the chamber. Temperatures of the heated air at the outlet were measured with a chromel–alumel (type K) bare wire thermocouple probe. Three-dimensional laminar and turbulent (k–e model) numerical simulations were obtained by solving the governing equations using th...
In this study, three Ranque–Hilsch vortex tubes were used, which have 9mm inside diameter and len... more In this study, three Ranque–Hilsch vortex tubes were used, which have 9mm inside diameter and length/diameter ratio was 15. Their performances were examined as one of the classical RHVT and other was hot cascade type RHVT. Performance analysis was according to temperature difference between the hot outlet and the inlet (ΔThot.). The ΔThot values of hot cascade type Ranque–Hilsch vortex
International Communications in Heat and Mass Transfer, 2005
Mixed convection heat transfer in a top and bottom heated rectangular channel with discrete heat ... more Mixed convection heat transfer in a top and bottom heated rectangular channel with discrete heat sources has been investigated experimentally for air. The lower and upper surfaces of the channel were equipped with 8 × 4 flush-mounted heat sources subjected to uniform heat flux. Sidewalls, the lower and upper walls were insulated and adiabatic. The experimental study was made for an aspect ratio of AR = 6, Reynolds numbers 955 ≤ Re Dh ≤ 2220 and modified Grashof numbers Gr * = 1.7 × 10 7 to 6.7 × 10 7 . From experimental measurements, surface temperature and Nusselt number distributions of the discrete heat sources were obtained for different Grashof numbers. Furthermore, Nusselt number distributions were calculated for different Reynolds numbers. Results show that surface temperatures increase with increasing Grashof number. The row-averaged Nusselt numbers first decrease with the row number and then, due to the increase in the buoyancy affected secondary flow and the onset of ins...
International Journal of Heat and Mass Transfer, 2006
Mixed convection heat transfer from arrays of discrete heat sources inside a horizontal channel h... more Mixed convection heat transfer from arrays of discrete heat sources inside a horizontal channel has been investigated experimentally. Each of the lower and upper surfaces of the channel was equipped with 8×4 flush mounted heat sources subjected to uniform heat flux. Sidewalls, lower and upper walls are insulated and adiabatic. The experimental parametric study was made for aspect ratios of
Enhancing the heat output of panel radiators, which are one of the most widely used heating syste... more Enhancing the heat output of panel radiators, which are one of the most widely used heating systems, could play an important role in energy saving. The aim of this study is to investigate the heat output of panel-convector-convector-panel (PCCP – type 22) radiators for different connection positions, and inlet/outlet temperatures using laboratory measurements and CFD analysis. Experimental studies were carried out in a climatized room. Same conditions were implemented in a CFD code. CFD results were validated with the experimental measurements, and a good agreement was obtained. The highest heat output for all inlet/outlet temperature ranges was obtained for the top-bottom-opposite-end connection position. In addition, the most uniform temperature distribution on the front panel was observed for the same connection position. It was observed that the effect of radiation on the heat output of the radiator could not be neglected. The simulation results performed for constant panel temp...
The influence of natural convection on the local and average heat transfer at increasing temperat... more The influence of natural convection on the local and average heat transfer at increasing temperature differences between the jet and the target plate from confined impinging jets has been experimentally and numerically investigated. Local Nusselt numbers were obtained numerically for jet Reynolds numbers in the range of 250–1000, and jet to target spacings of 2, 4, 8, 12 jet diameters at various modified Grashof numbers, to determine the effect of buoyancy induced natural convection. To determine the overall effect of natural convection on the average heat transfer, experiments have been conducted for Re numbers in the range 250–5000 and dimensionless jet to target spacing 2, 4, 6, 8, and 12 at increasing modified Grashof numbers. It has been determined that buoyancy induced natural convection might have opposing or assisting influence on local heat transfer at different locations of the target plate. It has also been shown that especially at low jet inlet velocities the average hea...
Bu calismada, surekli sartlarda isitilan bir hacimde meydana gelen laminer dogal konveksiyonla is... more Bu calismada, surekli sartlarda isitilan bir hacimde meydana gelen laminer dogal konveksiyonla isi transferi, ustten acik konumda, farkli isi akilarinda (q), farkli aciklik oranlarinda (AO), farkli egim acilarinda (EA) ve farkli geometrik oranlarda (GO) ele alinarak, hesaplamali akiskanlar dinamigi (HAD) yontemi kullanilarak incelenmistir. Isitilan hacmin bir kenarina sabit isi akisi uygulanmis, diger butun kenarlari yalitilmistir. Problem iki boyutlu olarak ele alinmis, kutle, momentum ve enerjinin korunumunu temsil eden denklemler, uygun sinir sartlari kullanilarak sayisal olarak cozulmustur. Elde edilen sonuclara gore aciklik oraninin artmasi ve bununla birlikte egim acisinin azalmasi ile ortalama Nusselt sayisinin arttigi (NuHort.), ortalama yuzey sicakliginin azaldigi gorulmustur.
Thermal control of electronic components is a continuously emerging problem as power loads keep i... more Thermal control of electronic components is a continuously emerging problem as power loads keep increasing. The present study is mainly focused on experimental and numerical investigation of impinging jet cooling of 18 (3 × 6 array) flash mounted electronic components under a constant heat flux condition inside a rectangular channel in which air, following impingement, is forced to exit in a single direction along the channel formed by the jet orifice plate and impingement plate. Copper blocks represent heat dissipating electronic components. Inlet flow velocities to the channel were measured by using a Laser Doppler Anemometer (LDA) system. Flow field observations were performed using a Particle Image Velocimetry (PIV) and thermocouples were used for temperature measurements. Experiments and simulations were conducted for Re = 4000 – 8000 at fixed value of H = 10 × Dh . Flow field results were presented and heat transfer results were interpreted using the flow measurement observati...
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 1996
Natural convection ventilation of a rectangular chamber containing a heated rectangular body has ... more Natural convection ventilation of a rectangular chamber containing a heated rectangular body has been investigated both experimentally and computationally. The heated square blockage within the partial enclosure was adjacent to the adiabatic lower surface of the chamber and the three exposed surfaces of the block were such as to give a constant heat flux. The air inlet and outlet were located at the bottom and top of the chamber vertical walls respectively, and were of equal area. Velocity measurements were performed using laser Doppler anemometry (LDA) with a one-component He–Ne laser connected to a burst spectrum analyser (BSA). Detailed velocity profiles were measured at the inlet, outlet and at several locations inside the chamber. Temperatures of the heated air at the outlet were measured with a chromel–alumel (type K) bare wire thermocouple probe. Three-dimensional laminar and turbulent (k–e model) numerical simulations were obtained by solving the governing equations using th...
In this study, three Ranque–Hilsch vortex tubes were used, which have 9mm inside diameter and len... more In this study, three Ranque–Hilsch vortex tubes were used, which have 9mm inside diameter and length/diameter ratio was 15. Their performances were examined as one of the classical RHVT and other was hot cascade type RHVT. Performance analysis was according to temperature difference between the hot outlet and the inlet (ΔThot.). The ΔThot values of hot cascade type Ranque–Hilsch vortex
International Communications in Heat and Mass Transfer, 2005
Mixed convection heat transfer in a top and bottom heated rectangular channel with discrete heat ... more Mixed convection heat transfer in a top and bottom heated rectangular channel with discrete heat sources has been investigated experimentally for air. The lower and upper surfaces of the channel were equipped with 8 × 4 flush-mounted heat sources subjected to uniform heat flux. Sidewalls, the lower and upper walls were insulated and adiabatic. The experimental study was made for an aspect ratio of AR = 6, Reynolds numbers 955 ≤ Re Dh ≤ 2220 and modified Grashof numbers Gr * = 1.7 × 10 7 to 6.7 × 10 7 . From experimental measurements, surface temperature and Nusselt number distributions of the discrete heat sources were obtained for different Grashof numbers. Furthermore, Nusselt number distributions were calculated for different Reynolds numbers. Results show that surface temperatures increase with increasing Grashof number. The row-averaged Nusselt numbers first decrease with the row number and then, due to the increase in the buoyancy affected secondary flow and the onset of ins...
International Journal of Heat and Mass Transfer, 2006
Mixed convection heat transfer from arrays of discrete heat sources inside a horizontal channel h... more Mixed convection heat transfer from arrays of discrete heat sources inside a horizontal channel has been investigated experimentally. Each of the lower and upper surfaces of the channel was equipped with 8×4 flush mounted heat sources subjected to uniform heat flux. Sidewalls, lower and upper walls are insulated and adiabatic. The experimental parametric study was made for aspect ratios of
Enhancing the heat output of panel radiators, which are one of the most widely used heating syste... more Enhancing the heat output of panel radiators, which are one of the most widely used heating systems, could play an important role in energy saving. The aim of this study is to investigate the heat output of panel-convector-convector-panel (PCCP – type 22) radiators for different connection positions, and inlet/outlet temperatures using laboratory measurements and CFD analysis. Experimental studies were carried out in a climatized room. Same conditions were implemented in a CFD code. CFD results were validated with the experimental measurements, and a good agreement was obtained. The highest heat output for all inlet/outlet temperature ranges was obtained for the top-bottom-opposite-end connection position. In addition, the most uniform temperature distribution on the front panel was observed for the same connection position. It was observed that the effect of radiation on the heat output of the radiator could not be neglected. The simulation results performed for constant panel temp...
The influence of natural convection on the local and average heat transfer at increasing temperat... more The influence of natural convection on the local and average heat transfer at increasing temperature differences between the jet and the target plate from confined impinging jets has been experimentally and numerically investigated. Local Nusselt numbers were obtained numerically for jet Reynolds numbers in the range of 250–1000, and jet to target spacings of 2, 4, 8, 12 jet diameters at various modified Grashof numbers, to determine the effect of buoyancy induced natural convection. To determine the overall effect of natural convection on the average heat transfer, experiments have been conducted for Re numbers in the range 250–5000 and dimensionless jet to target spacing 2, 4, 6, 8, and 12 at increasing modified Grashof numbers. It has been determined that buoyancy induced natural convection might have opposing or assisting influence on local heat transfer at different locations of the target plate. It has also been shown that especially at low jet inlet velocities the average hea...
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