Deniz Ulusarslan

• Professor
• Professor at Yıldız Technical University

Feeding the material to be transported in the hydraulic pipelines to the system is a subject open to research. The shape, size and density of the material gain importance in the selection of feeding systems. Finding the pressure drops that occur in the flow of spherical ice capsules with water is the basis of the research. However, before the measu...

Bu çalışmada çanak yansıtıcı vasıtasıyla yoğunlaştırılmış güneş ışınlarından faydalanılarak silisyum karbür potada alüminyum metalinin ergitilmesi teorik olarak incelenmiştir. İstanbul, İzmir, Antalya ve Mersin şehirlerinin iklim koşulları temel alınarak 5 farklı çanak ve alıcı(pota) çapı için hesaplamalar yapılmıştır ve potansiyel ergitilebilir al...

The study deals with experimental investigation of the effect of diameter ratio on velocity ratio and pressure gradient for the spherical capsule train with density lower than that of water conveyed by water in a horizontal pipe of diameter 0.1 m. Two different capsule diameters (d=0.08d=0.08 and 0.072 m) were investigated. Measurements were conduc...

This study investigated the experimental coefficient in the mathematical correlation for the pressure gradient of spherical capsule train flow according to flow regimes. The investigation was carried out in the 1.2 × 104 < Re < 1.5 × 105 range and under transport concentration of 5 – 30 %. Deviation between the pressure drops measured by experiment...

Design parameters of pipelines for capsule flow (i.e., power of pumps, number of pumps, diameters of capsules, diameter of pipe, etc.) can be calculated if pressure drops of such pipelines are estimated. All major and minor losses that incur at various levels depending on the diameter and type of pipeline selected for hydraulic transportation of ca...

This experimental investigation concerns the hydraulic transport of a spherical capsule train, whose density is equal to that of water (relative density; s=1), in horizontal pipes. In a system where the carrier fluid is water, pressure drops of two phase flow and capsule velocities were measured at 0.2-1.0 m/s bulk velocities and 5-20% capsule tran...

This experimental study investigated flow regimes of a spherical capsule train-water flow in horizontal pipes. The density of spherical capsules (made of polypropylene, s = 0.87) is close to that of ice (s = 0.82). The Re number of transition from laminar to turbulent flow for single-phase water in straight pipes is approximately 2300; the experime...

This study focuses on utilization and benefits of spherical ice capsules in district cooling systems, and describes the relevant study methods and results. Cooling carried out by means of the latent heat of ice will save on electrical energy. It will be possible to use an existing cooling system as a heating system in the winter, so that fuel will...

In the experimental part of this study, pressure drops that occur in the flow of a low density spherical capsule train conveyed by water in a horizontal pipe were found to be 5–30% of the capsule transport concentrations. The developed experimental relations were compared with well-known relations used for slurry flow. Experimental variables (i.e....

Design parameters (i.e., power of pumps, number of pumps, diameter of capsule, diameter of pipe, and geometry of pipe) of pipelines in which capsule flow can be developed if pressure drops (ΔP)m are caused by the two-phase flow are known. Therefore, designers are in need of a general model to calculate pressure drops. In the experimental part of th...

Design parameters of a pipelines capsule flow can be calculated if dependence of pressure drops on flow velocity and capsule concentration of such pipelines are known. For this purpose, loss coefficients of elbows were studied experimentally in pipeline loop of I.D. 0.1 m. Elbows with central angles of 90 and 45 made of PVC were used for low-densit...

This study yielded a mathematical expression to calculate the pressure gradient (ΔP/L)m of the flow of a spherical capsule train. An experimental investigation was carried out to determine pressure drops of two-phase mixture flow of spherical ice capsules and water inside the pipelines of cooling systems. Instead of ice capsules, spherical capsules...

An experimental investigation was carried out to determine pressure drops of the flow of a two-phase mixture of spherical ice capsules and water inside the pipelines of cooling systems. Instead of ice capsules, spherical capsules made of polypropylene material whose density (870kg/m3) is similar to that of ice were used in the experiments. Flow beh...

This is the first experimental study on capsule train flow conducted with spherical polypropylene capsules simulating spherical ice capsules in district cooling systems. This article explains experimental determination of the capsule velocity, capsule concentration rates (Cdyn. and Cst.) and the spacing between capsules for the flow of spherical ca...