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Laws of Thermodynamics
Published in S. Bobby Rauf, Thermodynamics Made Simple for Energy Engineers, 2021
Adiabatic process is a thermodynamic process in which no heat either enters or leaves the thermodynamic system boundary. Therefore, this process is a Non-Adiabatic Process. What is the change in entropy, Δs, in the turbine system?
Energy and the First Law of Thermodynamics
Published in Kavati Venkateswarlu, Engineering Thermodynamics, 2020
An adiabatic process is defined as a process during which there is no heat transfer. The word ‘adiabatic’ comes from the Greek word adiabatos, which means not to be passed. An adiabatic process can be made by insulating the system so that only an insignificant amount of heat passes through the boundary. It is important to note that though an adiabatic process does not involve any heat transfer, it involves work interaction between the system and surroundings, which can change the energy content and thus the temperature of the system.
Refinery Reactors
Published in James G. Speight, Refinery Feedstocks, 2020
By way of definition, an adiabatic process is a thermodynamic process during which no energy is transferred as heat across the boundaries of the system. This does not exclude energy transfer as work. The adiabatic process provides a rigorous conceptual basis for the theory used to expound the first law of thermodynamics, and as such, it is a key concept in thermodynamics. Some chemical and physical processes occur so rapidly that they may be conveniently described by the adiabatic approximation, meaning that there is not enough time for the transfer of energy as heat to take place to or from the system. An adiabatic reactor is designed to enhance and promote such reactions.
Creep life prediction for a nickel-based single crystal turbine blade
Published in Mechanics of Advanced Materials and Structures, 2022
Zhen Li, Zhixun Wen, Haiqing Pei, Xiaowei Yue, Pu Wang, Changsheng Ai, Zhufeng Yue
As is known to all, the isentropic process is also called the reversible adiabatic process. The adiabatic process is a thermal process in which the gas does not exchange heat with the external environment. When the process is proceeding very fast, the working fluid are too late to exchange heat with the external environment or the exchange of heat is very little. It can be approximately regarded as an adiabatic process. The compression process of the gas in the compressor of the turbine engine and the expansion process in the turbine as well as the exhaust nozzle can be regarded as an adiabatic process. The inlet boundary condition is a pressure inlet. The gas inlet angle, total pressure distortion intensity, and total temperature are shown in Figure 8. Among them, the definition of total pressure distortion intensity is shown in equation (10).
A review of bio-fuelled LHR engines
Published in International Journal of Ambient Energy, 2020
Krishna Kumar Pandey, S. Murugan
In thermodynamics, an adiabatic process is the one in which neither heat is added nor heat is lost during the process. Hence, in an adiabatic engine, no heat loss or minimum heat loss occurs during the combustion process. The adiabatic engine insulated with high-temperature materials of different engine components like the piston, combustion liner, combustion head, and valves, to permit the combustion process with the lowest heat transfer. Thus, the temperature of the combustion chamber is higher in the adiabatic engine with a minimum heat transfer than to the conventional engines (Roy Kamo 1987). The insulating materials generally used for ceramic coating in adiabatic engines are; silicon carbide, silicon nitride, zirconia (zirconium oxide). The most commonly used coating materials for examining the engine characteristics were PSZ (Reddy and Pandurangadu 2013), Mo and NiAl (Hazar 2010a), CoNiCrAl and NiCrBSi (Hazar 2017). The coating thickness used for PSZ was 0.5 mm while for Mo and NiAl; CoNiCrAl and NiCrBSi were 50 and 250 µm. The investigations were carried out by coating parts such as cylinder head, cylinder liner, valves and pistons (Reddy and Pandurangadu 2013; Hazar 2010a; Hazar 2017). The important results obtained for combustion, performance and emission of the coated engines are discussed in Section 5. Many of the researchers used partially stabilised zirconium (PSZ). Because, they have excellent insulating characteristics, thermal expansion characteristics and adequate strength (Reddy and Pandurangadu 2013). The exhaust gas temperature of the adiabatic engine is more than that of the standard engine. In an adiabatic diesel engine, hot wall combustion offers shorter ignition delay, multi-fuel combustion, with favourable effects of emissions, combustion noise and engine life (Kamo 1987).
Thermodynamic analysis of combined cycle system based on supercritical CO2 cycle and gas turbine with reheat and recuperation
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2023
Zhibo Lian, Yinke Qi, Diangui Huang
The combustion of fuel in the combustion chamber can be considered an adiabatic process. The first law of thermodynamics indicates that the enthalpy of the system before and after combustion is constant, which can be expressed as: