Energy balance of rapidly deforming foam filled cylindrical shells in a high pressure fluid environment

2021 ◽  
Vol 33 (9) ◽  
pp. 097107
Author(s):  
Carlos Javier ◽  
Shyamal Kishore ◽  
Koray Senol ◽  
Arun Shukla
Keyword(s):  
High Pressure ◽  
Energy Balance ◽  
Cylindrical Shells ◽  
Fluid Environment ◽  
Foam Filled

scholarly journals Elastic Response of Acoustic Coating on Fluid-Loaded Rib-Stiffened Cylindrical Shells

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Christopher Gilles Doherty ◽  
Steve C. Southward ◽  
Andrew J. Hull
Keyword(s):  
Cylindrical Shell ◽  
Cylindrical Shells ◽  
Coupled System ◽  
Elastic Response ◽  
System Response ◽  
Elastic Cylindrical Shell ◽  
Fluid Environment ◽  
Reinforcing Ribs ◽  
Double Index ◽  
Stress Boundary Conditions

Reinforced cylindrical shells are used in numerous industries; common examples include undersea vehicles, aircraft, and industrial piping. Current models typically incorporate approximation theories to determine shell behavior, which are limited by both thickness and frequency. In addition, many applications feature coatings on the shell interior or exterior that normally have thicknesses which must also be considered. To increase the fidelity of such systems, this work develops an analytic model of an elastic cylindrical shell featuring periodically spaced ring stiffeners with a coating applied to the outer surface. There is an external fluid environment. Beginning with the equations of elasticity for a solid, spatial-domain displacement field solutions are developed incorporating unknown wave propagation coefficients. These fields are used to determine stresses at the boundaries of the shell and coating, which are then coupled with stresses from the stiffeners and fluid. The stress boundary conditions contain double-index infinite summations, which are decoupled, truncated, and recombined into a global matrix equation. The solution to this global equation results in the displacement responses of the system as well as the exterior scattered pressure field. An incident acoustic wave excitation is considered. Thin-shell reference models are used for validation, and the predicted system response to an example simulation is examined. It is shown that the reinforcing ribs and coating add significant complexity to the overall cylindrical shell model; however, the proposed approach enables the study of structural and acoustic responses of the coupled system.

The Feasibility Research of Using an Intensified Continuous Mini-Reactor to Replace a Discontinuous Reactor

2011 ◽  
Vol 391-392 ◽  
pp. 894-899
Author(s):  
Shi Li ◽  
Yan Hu ◽  
Xi Ju Zong
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
High Pressure ◽  
Steady State ◽  
Energy Balance ◽  
Mathematic Model ◽  
Reaction Rates ◽  
Design And Optimization ◽  
Feasibility Research ◽  
Three Phase

An intensified continuous mini-reactor is introduced, to replace traditional discontinuous reactor, using in three-phase catalytic slurry hydrogenation. Under high pressure intensification, continuous mini-reactor behaves excellent performances of mass transfer and heat transfer, and presents the advantages of smaller volume, faster reaction rates, higher conversion and no solvent addition. The steady-state mathematic model is established, and the characteristic times of mass transfer and heat transfer are analyzed based on mass balance and energy balance Eq.s, the results can efficiently help the reactor design and optimization.

scholarly journals Energy balance of a high-pressure sodium arc tube.

1979 ◽  
Vol 3 (2) ◽  
pp. 11-17 ◽  
Author(s):  
Hidezoh AKUTSU ◽  
Naoki SAITO
Keyword(s):  
High Pressure ◽  
Energy Balance

scholarly journals ENERGY BALANCE AND EFFICIENCY IN WOOD SAWDUST BRIQUETTES PRODUCTION

FLORESTA ◽  
2014 ◽  
Vol 45 (2) ◽  
pp. 281 ◽  
Author(s):  
Ailton Teixeira Vale ◽  
Luiz Vicente Gentil
Keyword(s):  
High Pressure ◽  
Energy Balance ◽  
Total Energy ◽  
Manufacturing Process ◽  
Energy Demand ◽  
The State ◽  
Drying Process ◽  
High Pressure And Temperature ◽  
Wood Sawdust

AbstractEnergy balance and efficiency for densified sawdust production. The industrial wood briquette making process is an alternative to add value to forestry waste and involves the compaction of sawdust at high pressure and temperature. The present study was performed in an industry in the state of Goiás, Brazil. All kinds of energy involved in the wood briquette manufacturing process were qualified and quantified, in all stages of the process. The methodology used was based on Cotrim (1992), Silva (2001), (BEN, 2007), Inconprera (2008) and NBR 8633. The total energy demand to produce one ton of Pinus wood briquettes using sawdust at 43.8% moisture was 435 kWh. When producing the same amount of briquettes at 11% humidity, this value fell to 101.66 kWh per ton. Thus, drying process of sawdust consumes 76.63% of all the energy used for manufacturing. The amount of energy required for the production of 1 ton of briquettes corresponds to 10.8% (wet sawdust) and 4.37% (dry sawdust) of the energy contained in this one ton of briquettes.Keywords: Wood densification; industry of briquette; energy. ResumoEficiência e balanço energético na fabricação de briquetes de madeira. A briquetagem é uma alternativa para agregar valor a resíduos de origem agro florestal e consiste na compactação da serragem a elevadas pressões e temperatura. Este trabalho foi desenvolvido em uma indústria no estado de Goiás, onde foram quantificadas e caracterizadas todas as energias envolvidas no processo de fabricação de briquete em todas as etapas do processo industrial. A metodologia utilizada baseou-se em Cotrim (2003), Silva (2001), Brasil (2007), Inconprera (2008), ABNT (1984). A unidade utilizada foi kWh/t de briquete fabricado. A demanda total de energia para fabricar uma tonelada de briquete a partir de serragem de Pinus com 43,8% de umidade foi de 435 kWh/t. Quando se fabrica a mesma a quantidade de briquetes agora com umidade de 11%, este valor cai para 101,66 kWh/t. Assim, a secagem da serragem consome 76,63% de toda energia de fabricação. Entretanto com a serragem a 11% de umidade a maior demanda de energia eletricidade, com 64,06%. A energia necessária para produzir uma tonelada de briquete com serragem úmida (43,8%) corresponde a 10,8% da energia contida nesta 1 tonelada de briquete e com serragem seca a 4,37%.Palavras-chave: Briquetagem de madeira; indústria de briquete; energia.

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