Forward Osmosis Module Folded Plates Flow Regime
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Solution Overview
Problem
The existing forward osmosis membrane systems face issues with lower-than-theoretical membrane flux due to internal concentration polarization, particularly concentration polarization, which affects the efficiency of the membrane permeation flux.
Innovation Solution
The introduction of internal flow-guide folded plates within the FO membrane module, arranged alternately with specific angles and flow rates, creates a vortex to enhance liquid mixing and reduce concentration polarization, thereby improving the flow regime and permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If internal flow-guide folded plates are added to improve flow regime and reduce concentration polarization, then membrane permeation flux is improved, but device complexity increases
Solution Approach 1:
The flow channel is segmented by dividing it into multiple flow regions using folded plates. These folded plates partition the single flow channel into several distinct flow regions, allowing independent flow control and optimization in each region, thereby reducing concentration polarization and improving overall membrane permeation flux.
Solution Approach 2:
The folded plates extend into the flow channel depth, adding a third dimension to the flow distribution control. By creating folded plate structures that protrude into the flow path, the design transforms a two-dimensional flow distribution problem into a three-dimensional flow control system, enabling more effective mitigation of concentration polarization.
2Productivity
If folded plates are used to create vortex and improve mixing, then concentration polarization is reduced, but pressure loss increases
Solution Approach 1:
The folded plates are designed with specific geometries (angles of 45°, 60°, or 90°) that dynamically interact with the flowing liquid to generate vortex flow patterns. This dynamic flow structure enhances mixing and mass transfer at the membrane surface while the optimized geometry minimizes excessive pressure loss by avoiding overly complex or numerous folded plate arrangements.
3Productivity
If multiple folded plates are arranged alternately to enhance flow disturbance, then internal concentration polarization is mitigated, but manufacturing complexity increases
Solution Approach 1:
The folded plate assembly is segmented into multiple identical or similar units that can be manufactured separately and then assembled into the flow channel. This modular segmentation allows for standardized manufacturing processes and simplifies quality control while achieving the desired complex flow distribution pattern.
Solution Approach 2:
Multiple folded plates are merged into a single integrated component or closely spaced array within the flow channel. By combining several flow-guiding functions into one unified structure or tightly packed sequence, the design reduces the number of separate parts to be assembled while maintaining the beneficial flow disturbance effects.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the operating permeate flux of the FO membrane module by mitigating concentration polarization and reducing fouling, leading to improved mass transfer and efficient membrane performance.
Implementation Method 1
The draw solution flows through the channels between two folded plates and shrunken-enlarged flow is formed in turn to improve flow regimes by generating vortex
Implementation Method 2
water molecule is driven into draw solution side by high osmosis pressure through FO membrane from sludge mixed liquid side with low osmosis pressure
Data Source
AI summary
To provide a modified forward osmosis (FO) membrane module for flow regime improvement, the FO membrane module includes but not limited to: a water inlet; a water outlet; a forward osmosis (FO) membrane; a frame; and folded plates for improving flow regime in which draw solution is introduced into the water inlet of membrane module, then flowed through flow channels composed by three opposite folded plates vertically arranged on upper and bottom portions of the frame alternatively along horizontal direction with equal space; and drawn out from the water outlet. The flow regime improvement is achieved by increasing number of flow-guide folded plate, which results in the decrease of internal concentration polarization and membrane fouling. Structure of frame is modified to improve flow regime and to satisfy requirement of convenient and reliable connections between numbers of membrane modules in the FO membrane system.