Electrohydrodynamic Drying of Porous Materials

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Solution Overview

Problem

Conventional drying techniques for moist porous media, such as paper and pulp, are energy-intensive and rely on heat and airflow, making them inefficient and costly in terms of energy consumption.

Innovation Solution

The electrohydrodynamic (EHD) drying apparatus employs a non-uniform electric field to induce dielectrophoresis (DEP), separating the vapor phase from the liquid phase, thereby enhancing evaporation rates through a DEP force that moves vapor away from the porous medium, reducing energy requirements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If conventional drying techniques (convection, conduction, thermal radiation) are used, then moisture can be removed from porous media, but energy consumption is extremely high

Engineering Contradiction:

Improveenergy consumptionVSAvoiddrying efficiency

Core Design Contradiction:

Loss of energyVSProductivity

Solution Approach 1:

The patent replaces thermal-based drying mechanisms (convection, conduction, radiation) with an electrohydrodynamic system that uses non-uniform electric fields to generate dielectrophoretic forces. This substitution of physical mechanisms directly addresses the energy consumption problem by eliminating the need for high-temperature heating while maintaining effective moisture removal capability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention changes the fundamental parameter used for drying from thermal energy to electrical field intensity. By applying high voltage (e.g., 10-100 kV) to create strong non-uniform electric fields, the system generates dielectrophoretic forces that selectively move liquid water molecules, achieving rapid drying without the energy-intensive heating processes of conventional methods

Inventive Principle:

Principle #35Parameter changes

2Productivity

If high heat and airflow are applied for drying, then evaporation occurs, but energy requirements become excessive and costs increase

Engineering Contradiction:

Improveevaporation rateVSAvoidenergy requirements

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent replaces thermal convection and high-temperature evaporation with dielectrophoretic force-driven liquid water transport. The non-uniform electric field creates forces that directly move liquid water from the porous material, eliminating the need for energy-intensive heating and airflow while achieving enhanced evaporation rates

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention introduces a non-uniform electric field as an intermediary mechanism between the power source and the moisture in porous materials. This electric field intermediary generates dielectrophoretic forces that selectively act on liquid water molecules, enabling efficient moisture removal without direct thermal contact or high-energy airflow

Inventive Principle:

Principle #24Intermediary (Mediator)

3Loss of energy

If conventional drying methods are used, then moisture removal is achieved, but the process is costly in terms of energy consumption

Engineering Contradiction:

Improveenergy efficiencyVSAvoidprocess complexity

Core Design Contradiction:

Loss of energyVSEase of manufacture

Solution Approach 1:

The patent replaces complex thermal management systems (heaters, insulation, airflow control) with a relatively simple electrohydrodynamic system consisting of electrodes connected to a high-voltage power source. This substitution reduces energy losses while the added complexity of electrical field control is offset by the elimination of thermal infrastructure

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 increases evaporation rates by up to 132% and convective heat transfer coefficients by 242%, reducing the need for excessive heat and energy, while maintaining lower surface temperatures during the drying process.

Implementation Method 1

A non-uniform electric field is applied across the moist porous material in the EHD drying apparatus. The non-uniform electric field induces dielectrophoresis in the liquid water and/or water vapor present in the porous material.

Methodology Applied

Scientific EffectDielectrophoresis:

Implementation Method 2

The electric field induces coupled electrostatics and momentum for disposing liquid towards the high electric field for drying.

Methodology Applied

Scientific EffectElectrohydrodynamics: Electrohydrodynamics

Data Source

PatentUS20230088399A1Electrohydrodynamic drying of moist porous materials

Publication Date: 2023.03.23 WORCESTER POLYTECHNIC INSTITUTE

AI summary

An electrohydrodynamic (EHD) drying apparatus includes a non-uniform electric field resulting from an electric field source operable for a high potential, and an electric field source operable for a low potential. A power source is connected to the electric field sources for producing the non uniform electric field for inducing dielectrophoresis (DEP) in an article within the uniform electric field. In particular configurations, the applied non-uniform electric field is for separating a vapor phase being formed during drying from the liquid phase. The electric field source defines a polarizer adapted to produce dielectrophoresis, and the electric field induces coupled electrostatics and momentum for disposing liquid towards the high electric field for drying.