temperature

The article presents the study results of air distribution in a room with a flat air jet. In particular, dynamic pressure, density and viscosity of air flow were considered. Aim of a paper is to numerically simulate these physical properties of a flat air jet in a room. A graphical representation of air jet parameters was obtained using package CFD Ansys FLUENT software. A hypothesis of applying Mendeleev-Clapeyron equation to moving air flow was considered. Flat air jets have been found to be effective in terms of velocity attenuation in indoor air distribution.

This study presents a methodology for assessing the technical condition of district heating pipelines under high wear, variable thermal loads, and limited modernization resources. Emphasis is placed on installation defects, cyclic temperature and pressure fluctuations, and corrosion-induced degradation. A case study of a return water pipeline in Kremenchuk, featuring a 3° installation misalignment and 10 cm flange displacement, demonstrated stresses of 220–250 MPa, exceeding the steel’s yield strength in critical zones.

This paper is dedicated to the development of a unified system for monitoring microclimate parameters in the terrariums of the Kyiv Zoo. In cooperation with zoo representatives, existing methods and devices for artificially creating a microclimate in exhibition modules were reviewed and analyzed. The issues of this process were examined, and the main parameters for animal housing conditions were determined, such as air or water temperature, humidity, illumination, and the level of ultraviolet radiation. Six exhibition modules were selected for experimental studies.

Contact methods are usually used to measure the temperature of industrial technological objects. When using the contact method to create the necessary conditions for heat exchange, thermal transducer must be in direct contact with the object of study, the temperature of which must be measured. When measuring stationary temperatures, the readings must be taken after a certain time interval from the moment of contact of the thermal transducer with the object of study, when a state of thermal equilibrium is established between them.

The present paper examines the impact of preheating a titanium alloy on cutting force and surface quality during turning. The primary objective of the present study is to ascertain how variations in workpiece temperature prior to machining affect the technological parameters of the cutting process, specifically cutting force and the surface roughness parameter Ra. The experimental portion of the study involved the turning of a Ti-6Al-4V titanium alloy workpiece at numerous preheating temperatures, including room temperature, 300°C, 400°C, 500°C, and 600°C.

The article is devoted to the study of the features of continuous monitoring of changes in the color of information channels of passive pressure-temperature sensors, tracking the spectral distribution of the light intensity of the liquid crystal color depending on the operating conditions. The main direction of application of such sensors can be “screening” of chemically active environments, deployment of temporary objects of short-term use in conditions of a pandemic, or military operations, etc.

Problem statement and the research purpose. One of the main factors determining the intensity of tool wear is the temperature that arises during the cutting process. Thus, the objective is to investigate the patterns and obtain dependencies of heat generation and heat transfer between the elements of the cutting process that characterize the temperature of the tool’s teeth and blades.

The temperature of gas flows is an important parameter during the research of heat and mass transfer processes, in the field of gas dynamics, as well as in manufacturing. Therefore, it is necessary to ensure a high level of requirements for the accuracy and reliability of the primary means of temperature measurement. The basic requirements are the simplicity of the design of the thermotransducer, its low thermal inertia, small dimensions, and high reliability during operation in aggressive environments at high temperature and pressure conditions.

Static and dynamic characteristics of the drying process as an object of automation are experimentally determined in the work. It was established that the drying object can be represented as two linked "air" – "drying object" and has interconnected input and output parameters. A mathematical description of the static and dynamic characteristics of the drying process as an object of automatic regulation has been researched and carried out.

The work proposes the use of a unique method of creating passive, multifunctional, non-contact pressure-temperature sensors. The basis of this method is a combination of inorganic semiconductors and high-molecular organic cholesteric crystals. According to their morphology, such crystals represent a spiral structure that is sensitive to changes in external physical factors, such as temperatures, due to changes in the periodicity of the structure, which leads to Bragg diffraction scattering of light on it.