Hernandez-Trejo A¹, B Estrada-Drouaillet¹, JA López-Santillán¹, C Rios-Velasco², SE Varela-Fuentes¹, R Rodríguez-Herrera³, E Osorio-Hernández¹

Phyton-International Journal of Experimental Botany, Vol.88, No.1, pp. 47-54, 2019, DOI:10.32604/phyton.2019.04611

Abstract The control of Spodoptera frugiperda is based on synthetic insecticides, so some alternatives are the use of entomopathogenic fungi (EF) and neem extract. The objective of the study was to evaluate in vitro effectiveness of native EF and neem extracts on S. frugiperda larvae. Six EF were identified by DNA sequencing of ITS regions from three EF (Fusarium solani, Metarrhizium robertsii, Nigrospora spherica and Penicillium citrinum). They were evaluated in concentrations of 1 × 10⁸ spores/ mL. In addition, a second bioassay was carried out evaluating only F. solani, M. robertsii and N. sphaerica and… More >

Cong Liu, Guojun Yu*, Sheng Jia

The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.3, pp. 156-156, 2019, DOI:10.32604/icces.2019.05101

Abstract Geothermal energy, clean and renewable, has attracted more and more attention in this century challenged by energy crisis and climate change. Ground source heat pump (GSHP) technology, which has been widely applied in the field of heating, ventilating and air conditioning (HVAC), is one of the most important ways to utilize geothermal energy. The buried pipe heat exchanger system is the core of GSHP, sufficient investigations should be conducted prior to its design to clarify the relevant thermal and hydraulic characteristics. Numerical calculation is much more practical than experimental research for the buried pipe heat… More >

Na Wei^1,*, Jinzhou Zhao¹, Wantong Sun¹, Shouwei Zhou¹, Liehui Zhang¹, Qingping Li², Haitao Li¹, Qiang Fu^1,2, Xin Lv², Lijun Zheng²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 84-86, 2019, DOI:10.32604/icces.2019.04533

Abstract Currently, marine natural gas hydrate has attracted people’s attention due to its huge amount of resources. As a creative way to securely and efficiently exploit metastable hydrate reservoir which is in shallow subsurface of sea floor and with weak cementing, the method of solid fluidization exploitation is to excavate and crush the marine natural gas hydrate reservoir, transport the hydrate to the sea surface platform through the airtight pipeline, and finally the methane gas is obtained after post-processing.
In the process that the hydrate solid particles are transported up, as the temperature rises and the pressure… More >

Naoto Mitsume^*, Tomonori Yamada, Shinobu Yoshimura

The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 65-65, 2019, DOI:10.32604/icces.2019.05538

Abstract Research and development with regard to advanced coal-fired power plants to reduce CO2 emission have been conducted. Coal gasification is one of the key technologies. In reactor for the coal gasification, coal is crushed into fine particulate matter and then partially burned into gas in a high-pressure environment in the reactor. Our research group has carried out a project to tackle a coupled problem of thermo-fluid-structure interaction for quantification of its efficiency, environmental load, and structural integrity. As one of key components of the project, we present a large-scale parallel simulation of three-dimensional (3D) thermal… More >

Jeffrey T. Fong^1,*, Pedro V. Marcal², Robert Rainsberger³, N. A. Heckert¹, J. J. Filliben¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.2, pp. 45-45, 2019, DOI:10.32604/icces.2019.05432

Abstract When a small crack is detected in a pressure vessel or piping, we can estimate the fatigue life of the vessel or piping by applying the classical law of fracture mechanics for crack growth if we are certain that the crack growth exponent is correct and the crack geometry is a simple plane. Unfortunately, for an ageing vessel or piping, the degradation will change the crack growth exponent, and the crack will advance not in a simple planar fashion. To validate the crack growth exponent for an ageing vessel or piping with a crack of… More >

Eunsoo Choi^1,*, Yunkyu Ha¹, Duhyeon Kim¹, Hoan D. Nguyen¹, Tae Yeong Kim¹, Seong Jun Park¹, Yeon-seong Lee¹, Cheolki Min²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 13-13, 2019, DOI:10.32604/icces.2019.05356

Abstract This study was to provide a new aspect of application of shape memory alloys (SMAs) in civil engineering. The high-density polyethylene (HDPE) have been used for construction of pipelines for several years. The main problem of using HDPE for pipes is the joint of two adjacent pipes. In case of having a perfect joint, the HDPE pipeline can bare the internal pressure up to 90 MPa. However, in practice, it can rarely achieve to a perfect pipe joint due to the complicated process, so, it prone to fracture in low internal pressure. To overcome this,… More >

Jun Du^1,*, Xin Wu¹, Ruonan Li¹, Ranran Cheng¹

FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.1, pp. 77-87, 2019, DOI:10.32604/fdmp.2019.05949

Abstract In this paper, we take the mid-temperature gravity heat pipe exchanger as the research object, simulate the fluid flow field, temperature field and the working state of heat pipe in the heat exchanger by Fluent software. The effects of different operating parameters and fin parameters on the heat transfer performance of heat exchangers are studied. The results show that the heat transfer performance of the mid-temperature gravity heat pipe exchanger is the best when the fin spacing is between 5 mm and 6 mm, the height of the heat pipe is between 12 mm and More >

Mirmanto^*, I.B. Alit, I.M.A. Sayoga, R. Sutanto, Nurchayati, A. Mulyanto

Frontiers in Heat and Mass Transfer, Vol.10, pp. 1-7, 2018, DOI:10.5098/hmt.10.34

Abstract A comparison study of the use of two different heat removal units was conducted to examine the performance of thermoelectric cooler box. The heat removal units employed were a heat sink fin-fan and a double fan heat pipe. Parameters measured as performance indicators are cooling capacity, temperature differences, and COP. In addition, the effect of electrical power on temperature difference and COP was also investigated. The cooler box size is 285 mm x 245 mm x 200 mm and constructed from styrofoam. The results show that there is no difference of the use of a More >

Michael Petrucci, Amir Faghri^*

Frontiers in Heat and Mass Transfer, Vol.11, pp. 1-9, 2018, DOI:10.5098/hmt.11.37

Abstract The results of integrating heat pipes into the vanes of a turbofan engine are presented. These Heat Pipe Turbine Vanes (HPTV) are integrated into the compressor exit, turbine inlet, and exhaust flow for vane cooling and waste heat recovery. Thermodynamic analysis of HPTV turbofan engines is done and comparisons are made between heat pipe turbine vane cooling and conventional film cooling techniques. Heat transfer through the vanes is analyzed using a thermal network model. Limitations on the heat transfer caused by various limiting phenomena within the heat pipe are also determined. More >

Ralph Eismann^a,† , Robert Adams^b

Frontiers in Heat and Mass Transfer, Vol.11, pp. 1-7, 2018, DOI:10.5098/hmt.11.4

Abstract Convergence of numerical schemes for pipe network analysis requires continuous modelling of pressure losses in the transition region between laminar and turbulent regions. Several existing correlations for the friction factor of straight pipes and helical tubes are presented. Based on these correlations a new explicit correlation for helical tubes with arbitrary surface roughness is derived. The friction factor is expressed as a continuous function of the Reynolds number covering laminar, transitional, and turbulent flow regions. Potential sources of error are also discussed, including the effects of tube deformation caused by the bending process. More >