Countercurrent exchange

About: Countercurrent exchange is a research topic. Over the lifetime, 2255 publications have been published within this topic receiving 28687 citations. The topic is also known as: Countercurrent exchange.

Gas-liquid separation type planar heat exchanger

Abstract: The present invention relates to a gas-liquid separation type planar heat exchanger, and more particularly the gas-liquid separation type planar heat exchanger includes superposed heat transfer plates with a given size for preventing different fluids from mixing and enhancing heat exchange efficiency by causing countercurrent heat exchange, and a gas-liquid separation part arranged in the upper side of a casing so as to separate a liquid phase fluid contained in a fluid having transformed into a gaseous phase, thus discharging a fluid of pure gaseous phase

Device for continuous countercurrent leaching of grinding waste

Abstract: The utility model discloses a device for continuous countercurrent leaching of grinding waste. The device comprises two countercurrent leaching devices and a solid-liquid separation box, each of the two countercurrent leaching devices consists of an auger motor, a countercurrent cylinder, a feeding pipe, a reaction cone, an auger and a first filter screen; the top of the countercurrent cylinder inthe first countercurrent leaching device is communicated with the reaction cone in the second countercurrent leaching device through a discharge pipe, the top of the countercurrent cylinder in the second countercurrent leaching device is connected with the top end of the solid-liquid separation box through the other discharge pipe, and the packing auger is arranged in the countercurrent cylinder.According to the utility model, the inner conical cylinder is arranged; grinding waste and leaching liquid can be conveniently placed for leaching reaction; and the inner conical barrel can periodically rotate in the outer conical barrel, so that stirring of a reaction solution is achieved, the leaching reaction is fully conducted, through the arrangement of the two sets of countercurrent leaching devices, secondary leaching of the grinding waste is facilitated, and it is guaranteed that metal materials in the grinding waste can be fully extracted.

Effect of gas-induced inlet design on flow pattern and energy loss for small-scale countercurrent vortex reactor: Numerical simulation and experimental investigation

Abstract: Small-scale vortex reactors have gained attention in the fields of gas-particle multiphase reactions because of the great potential of process intensification. Their performances highly depend upon the vortex flow-induced structure. However, its role has not yet been completely understood. To address the effect of the vortex flow-induced design of a small-scale countercurrent vortex reactor, the gas-induced inlet design with varying aspect ratio (the ratio of inlet height to inlet width of 0.56, 2.25, and 5.06) was designed to numerically and experimentally investigate the flow distribution, energy loss, and process intensification. It was found that for a given flow rate (inlet velocity), and with increasing aspect ratio the maximum tangential velocity is increased whereas the decay of the vortex flow is decreased. The semi-empirical equations were further developed to characterize the spatial distribution of the gas tangential velocity. There is no significant differentiation in axial velocity, but the static pressure near the wall increases significantly. Moreover, the pressure drop of the reactor increases as the inlet aspect ratio increases. Finally, an aspect ratio of 2.25 was found to be optimum for potential multiphase mixing and mass transfer. The results may provide a positive reference for the vortex-flow-based process intensification. • Gas-induced inlet design of a small-scale countercurrent vortex reactor. • Effect of aspect ratio on flow pattern and pressure loss were determined. • Semi-empirical correlation was developed for characterizing tangential velocity. • Insight into the potential improvement was made for process intensification.