in this paper, a reaction system consisting of two parallel, non-isothermal autocatalytic reactions in a continuous stirred tank reactor (cstr) has been considered. reactor chaotic behavior is possible for certain values of system parameters. two types of controllers are designed and compared in order to control both the reactor temperature and the product concentration. the first controller is...

In this paper we examine the effect of mild stenosis on blood flow, in an irregular axisymmetric artery with oscillating pressure gradient. The Herschel-Bulkley fluid model has been utilized for this study. The combined influence of an asymmetric shape and surface irregularities of constriction has been explored in this computational study. An extensive quantitative analysis has been performed ...

A unique Taylor-vortex membrane reactor (TVMR) design for continuous gas-liquid reactions is presented in this work. The consists of a cylindrical rotor inside stationary concentric vessel, and flexible system equispaced baffle rings surrounding the rotor. This restricts annular cross section to small gap between baffles rotor, divides annulus into 18 mixing zones. support 6 m long PFA tubular ...

Limbah cair industri tepung tapioka mengandung bahan-bahan organik dengan kosentrasi yang tinggi yaitu COD sekitar 7.000 - 30.000 mg/L dan BOD 3000-6000 sehingga memiliki potensi untuk digunakan sebagai bahan baku pembuatan biogas. Dengan menggunakan fermentasi secara anaerobik di dalam reaktor (digester), limbah mengalami proses dekomposisi menjadi biogas oleh mikroorganisme anaerob. Beberapa ...

The paper compares conceptual designs of a microstructured reactor/heat-exchanger for the small-scale production C8+ range hydrocarbons from methanol over H-ZSM-5 catalytic coatings. In these designs, air was used as cooling fluid in adjacent channels. heat transfer characteristics single-zone reactor (with channels 500 μm diameter) and two-zone an additional coolant inlet) have been compared. ...

The disturbance sensitivity of an integrated plant is to a large extent caused by interactions between the process units, imposed by material and energy recycle flows. In this paper we show how a plug flow (delay) tank integrated in the recycle path can be used to modify these interactions such as to reduce the disturbance sensitivity in a given frequency range. The principle idea is to modify ...

The increasing share of renewable electricity in the grid drives need for sufficient storage capacity. Especially seasonal storage, power-to-gas can be a promising approach. Biologically produced methane from hydrogen surplus used to substitute natural gas existing infrastructure. Current reactor types are not or poorly optimized flexible methanation. Therefore, this work proposes new type with...