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Numerical Heat Transfer And Fluid Flow

A comprehensive review on the state-of-the-art of piezoelectric energy harvesting

The state-of-the-art review on energy harvesting from flow-induced vibrations

Structural vibrations caused by a flowing fluid. Whenever a structure is exposed to a flowing fluid,…

Flow-induced vibration

This work provides an overview of the most common polymeric corrosion inhibitors for the oil and gas industry Exploration, production and transportation of petroleum and natural gas products constantly deal with highly corrosive environments due to oxygen, acid stimulation, CO2 and H2S contamination Therefore, versatile materials are required in order to keep corrosion rates in control Unlike small molecule corrosion inhibitors, polymers possess multi-functionality and better film-forming capabilities, which could significantly improve protective barrier properties In this article, polymeric architectures tested in relevant oil and gas media are compiled in order to highlight certain moieties capable of complex formation with the metal surface or chelation on corrosive agents resulting to improved corrosion inhibition

Polymeric corrosion inhibitors for the oil and gas industry: Design principles and mechanism

The invention relates to a device and a method for swinging power generation and vibration suppression by using arc-shaped wing plates with uneven surfaces. The device is formed by two parts: a swirlswinging system and a current collecting system. The swirl swinging system comprises a current collecting vertical pipe, a steering bearing, nanometer material arc-shaped power generating wing platesand flexible tail plates; and the current collecting system comprises a telescopic power generation cylinder, a waterproof electric slip ring and a waterproof power transmission line. According to thedevice, under the combined action that the nanometer material arc-shaped power generating wing plates divide a flowing space and adjust a flowing direction, the nanometer material arc-shaped power generating wing plates drive the flexible tail plates to swing so as to destroy a tail vortex street, and hemispheric bulges and trumpet-shaped deflector holes disturb a flow-around boundary layer, vortex-induced vibration suppression without energy consumption is realized; and in addition, the bending and the deforming of the nanometer material arc-shaped power generating wing plates, the deformingof the hemispheric bulges, and the reciprocating telescopic action of the telescopic power generation cylinder produce currents, so that the conversion of ocean current energy is realized synchronously.

Device and method for swinging power generation and vibration suppression by using arc-shaped wing plates with uneven surfaces

Flow structures around a circular cylinder with bilateral splitter plates and their dynamic characteristics

Dual organic-structure directing agents in the synthesis of high-silica MOR Zeolite: Cooperation or competition?

Riser vortex-induced vibration (VIV) has been the outstanding problem affecting the normal safe operation in offshore oil exploitation. In this paper, based on computational fluid dynamics, a three-dimensional large eddy simulation (LES) numerical model was used to calculate the flow fields of unsteady flow around marine riser with different approaching flow velocities. Then streamlines, velocity and vorticity contours, drag and lift coefficients in different conditions were obtained. Simulation results indicate that the flow properties in different depth display obvious difference, which present complex three dimensional characteristics with interacting. It is thus clear that flow around marine riser can not be regarded as plane potential flow simply. The results also show that with larger approaching flow velocity, lift coefficient amplitude is bigger and frequency is higher, which is easier to result in vibration. Our approach may provide some references for safe design and engineering practice of VIV controlling of marine riser.

Hongjun Zhu

Papers

Device and method for swinging power generation and vibration suppression by using arc-shaped wing plates with uneven surfaces

Flow structures around a circular cylinder with bilateral splitter plates and their dynamic characteristics

Dual organic-structure directing agents in the synthesis of high-silica MOR Zeolite: Cooperation or competition?

Large Eddy Simulations of Unsteady Wakes behind Riser in Offshore Deep Water

Dip-Coating Method of Preparation of a Silicon-Modified Acrylic Resin Hydrophobic Coating with Corrosion Resistance for Copper–Aluminium Composite