Anca Constantin

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Verified

Anca verified their affiliation via an institutional email.

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• PhD
• Professor (Associate), Dean at Ovidius University

In heavy soils, changes in humidity incur soil volume changes. In the horizontal plane, these are manifested by cracks formation and in the vertical plane by the movement of the soil surface. Cracks have a significant impact on hydrodynamics of the soil profile. The work is based on the hypothesis that soil volume changes depend on both the content...

In the context of sustainable development effort, the water supply systems in the rural area of Constanta County should be optimally designed, so that their safe, efficient operation is assured. The results obtained by numerical simulation showed that Movila Verde -Independenta water supply duct might be subject of cavitation occurrence during hydr...

The body temperature of a diver is one of the most important aspects of the concept of underwater safety and comfort. The heat balance equation previously established, was improved in this paper by introducing a linear dependence of the absolute humidity on the body temperature, as the absolute humidity influences the latent heat flux needed for th...

An exemplary construction project developed in a commune close to Constanta, Romania, aims to build wooden houses for families with low income. The study focuses on their energy performance, aiming to determine simple technical solutions for the improvement of energy efficiency. The original house is a duplex ground floor building. The energy asses...

Dobrogea is a Romanian region surrounded by waters: Low Danube at West, the Danube Delta at North and the Black Sea East. Although its location is in the proximity of large water bodies, its climate is dry, and it benefits from only a small number of rivers and creeks and some lakes with fresh or brackish water. The groundwater instead is generous,...

Human health and well-being are modern day challenges that are directly related to quality of drinking water supply. The study is focused on a newly conceived independent water supply system in Plopeni, which takes water from a good quality underground source, and supplies seven villages either by a series of pumping installations or by gravity....

Lipnița is a village situated in a hilly region, in Constanta County. The water supply system has its own groundwater water source, placed in the middle of the village at a low elevation. Water is conveyed, by a long transmission duct to a storage tank from which it flows by gravity to the consumers. The distribution network has two long mains that...

Water and energy are among the most valuable resources worldwide, therefore specialists have to focus on technical means that enable better use thereof, also with respect to safety and efficiency. The study presents the operation efficiency improvement of a newly modernised water supply pumping station in Galesu irrigation system in the Dobrogea re...

Dynamics of the air flow through the system comprising the breathing apparatus and the human breathing ways affects the easiness the diver is breathing with and, subsequently his underwater comfort. Experimental investigation on eight divers in a wet hyperbaric simulator allowed us to collect data regarding the breathing flow rate and frequency, an...

This paper presents the automatic calculation program for steady water flow, RIMIS and the physical model developed by authors for the study of water motion in a distribution network. The study was concentrated upon looped type networks, frequently used in water supply systems and also in industrial or irrigation installations. Experimental results...

Transient movement results as a hydraulic system response to sudden valve manoeuvres in a water supply network. Investigation on pressure variation was carried out on a representative loop of a pipe network. Both numerical simulation and experimental laboratory measurements were developed in order to validate the software Hammer for looped networks...

Surge tank and air chamber are the most used devices to protect a pumping installation from either cavitation or excessive pressure during water hammer. These devices transform the water rapid variable movement into a slow oscillatory one. The choice of the optimal protection solution should rely not only on hydraulic, but also on technical and eco...

Numerical simulation and experimental laboratory measurements were developed in order to study the unsteady flow of water in a single loop distribution network. Transient movement results as a hydraulic system response to sudden valve maneuvers in a water supply network. Investigation on pressure variation was carried out on a representative loop,...

The present paper presents the comparative analysis of the hydraulic parameters, respectively flow rate and pressure, determined on a physical model and also calculated by the use of the automatic program for steady flow, RIMIS. The physical model was developed by the authors for the study of motion in a water distribution looped network. The compa...

The surge tanks, assumed to have no hydraulic loss at the bottom connection to the main discharge duct, are the simplest and safest protective device. An important number of pumping stations, part of the Romanian irrigation systems, were conceived with a surge tank mounted by the pump, on the discharge duct, in order to protect the installation fro...

Air may be efficiently used in water pumping system protection from hydraulic shock, due to its elasticity. The paper presents the results regarding the extreme pressures in the discharge duct of a pumping installation, obtained by numerical simulation of the water hammer phenomenon in two cases of protection with air: using air chamber and using f...

Air chamber and free air dispersed throughout the water are two efficient means of protection of a discharge duct from water hammer damages. The paper presents the results regarding the extreme pressures in the discharge duct of a pumping installation, obtained by numerical simulation of the water hammer phenomenon in both cases of protection with...

An important number of pumping stations, part of the Romanian irrigation systems, were conceived with surge tank mounted on the discharge duct, next to the pump, in order to protect the installation from hydraulic shock. In practice, the dimensioning of such protection device usually implies a large volume of hydraulic computation. Therefore the ac...

The study presented by this paper depicts the differences between the kinematics and dynamics of a grabber mechanism when it operates in atmospheric or underwater environment. The grabber we refer to is attached to an underwater vehicle/robot. The modification in angular acceleration of the fingered mechanism is caused by the enhanced underwater fr...

The equipment provides life support for diving operations in shallow water (max 50 feet of seawater). A compressed air cylinder, of high capacity, kept at surface, allows a great duration of the underwater activity. The system consists of a mask with demand regulator, an umbilical assembly and an emergency air supply. The system offers safety, comf...