Meandering Fluid Channel for Algae Biodiesel Production
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Solution Overview
Problem
Current methods for producing biodiesel from algae are inefficient in maximizing surface area and reaction speed, leading to suboptimal conversion of waste into fuel.
Innovation Solution
The use of meandering fluid channel devices with optimized channel height-to-width ratios and integrated light sources to enhance light absorption and algae growth, combined with microfluidic and mesofluidic techniques for efficient mixing and solvent extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional reaction chambers are used for algae cultivation, then the device structure is simple, but the surface area to volume ratio is low and light penetration is insufficient
Solution Approach 1:
The patent transitions from conventional three-dimensional bulk cultivation to two-dimensional planar microfluidic channels. This dimensional reduction increases the surface area to volume ratio dramatically, allowing much greater light penetration and algae exposure to light sources while maintaining a compact device footprint. The planar channel structure enables top-down light illumination that penetrates directly through the fluid layer.
Solution Approach 2:
The reaction chamber is segmented into multiple parallel microfluidic channels rather than a single large chamber. This segmentation increases the total surface area available for light interaction while maintaining manageable channel dimensions that allow complete light penetration. The segmented structure also improves flow distribution and prevents dead zones.
2Productivity
If conventional mixing methods are used, then the mixing mechanism is simple, but the mixing efficiency and reaction speed are slow
Solution Approach 1:
The patent employs acoustic standing waves generated by surface acoustic wave (SAW) transducers to induce intense mixing of the algae culture medium. The acoustic vibrations create chaotic advection and enhance mass transfer between different fluid streams, dramatically accelerating reaction kinetics and homogenizing the culture without requiring mechanical stirrers or pumps.
Solution Approach 2:
Conventional mechanical mixing systems (magnetic stirrers, overhead mixers) are replaced with acoustic field-based mixing. Surface acoustic waves generate fluid motion and mixing through acoustic radiation pressure and streaming effects, eliminating moving mechanical parts while achieving superior mixing efficiency in the microfluidic regime.
3Quantity of substance
If traditional extraction methods are used, then the extraction process is simple, but the solvent extraction efficiency and oil recovery rate are low
Solution Approach 1:
The patent uses supercritical fluid extraction where carbon dioxide is pressurized and heated to supercritical conditions, then passed through the algae biomass in the microfluidic channel. The supercritical fluid acts as an extraction medium that dissolves lipids and oils, which are then recovered by depressurization. This hydraulic-pneumatic system achieves high extraction efficiency without organic solvents.
Solution Approach 2:
The extraction process exploits phase transitions of carbon dioxide between supercritical and gaseous states. By controlling pressure and temperature, CO2 transitions to a supercritical phase for extraction, then returns to gaseous phase for easy separation from the extracted oils, enabling solvent-free extraction and automatic solvent recovery.
4Productivity
If large volume reaction chambers are used, then the total reaction capacity is high, but the light penetration depth is insufficient and reaction efficiency decreases
Solution Approach 1:
The patent resolves the light penetration limitation by transitioning from volumetric three-dimensional reaction chambers to surface-based two-dimensional microfluidic channels. This dimensional change ensures that the maximum depth of any fluid element from the light source is limited to the channel height (micrometers), guaranteeing complete light penetration across the entire reaction volume while maintaining high total throughput through parallel channel arrays.
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 approach significantly increases the efficiency and speed of biodiesel production by maximizing surface area and light utilization, ensuring complete waste conversion and rapid oil or hydrogen production.
Implementation Method 1
a circuit comprising meandering fluid channels having a first index of refraction; the fluid channels comprising liquid having a second index of refraction
Implementation Method 2
a shape of an interface between the first index of refraction and the second index of refraction is so selected to maximize the amount of light incident on the circuit guided into the channels
Implementation Method 3
subjecting the biological or chemical material to light for a time and under conditions to allow the biological or chemical material to react
Data Source
AI summary
Methods and devices of performing reactions for which presence of light is desirable are provided. Biological or chemical materials such as algae are put in a chamber shaped as a meandering fluid channel. The algae can be combined with biomass such as human or animal waste and then subject to light, such as natural light or light coming from a LED, to produce fuel. Production of fuel can be optimized by controlling the height-to-width ratio of the channels.