EHD PUMP Conceptual Design Review

University of Nebraska - Lincoln

NASA Goddard Space Flight Center

Mission Overview

Experiment goals

Theories of Operation

Concept of Operation

Experiment Application

Past Research

Mission Requirements

Expected Results

Mission Overview • Experiment Goals:

• Effects of micro gravity on

interaction of flow fields and

electrical fields with and without

phase change

• Effects of micro gravity on

electrically driven film boiling

• Validate concept for space station

execution applications.

• Applications

• EHD pump for onboard processors

• EHD pumps for micro and nano

scales

• High heat flux thermal control

• Multifunctional plates

Design Concept

Thin Film Evaporation Concept:

• Minimum Success: Demonstration

of EHD Thin Film Liquid Pumping

• Investigate

• the effects of gravity on the net

electrically generated two

phase flow

• The effects of gravity on

electrically driven film boiling

• Convective boiling heat

transfer coefficient in low mass

flux levels in the absence of

gravity

EHD Force Components

• Electrophoretic: charge generation by electro-chemical reaction

• Liquid Pumping

• Function of electric field, temperature & fluid quality

• Di-electrophoretic: take advantage of permittivity gradients,e.g,

two phase flow.

• Phase & Fluid Management

• Thin Film Evaporation

• Electrostriction: Compressible Flow

Theories of Operation

EHD Electrophoretic Force Generation

Asymmetric Geometry leads to higher pressure head: configuration is

impractical for spacecraft applications

Concepts of Operation

• Experiment Operation during Microgravity

Flight Trajectory Acceleration Profile

Experiment Application

• Breadboard EHD Thermal Control System

• Thermal Control using liquid thin film evaporation

• Fluid Management to address ‘hot spots’

• EHD as integrated and embedded subsystem for processor

design

• application of NASA HQ Fluid physics Investigation

• Technology Development Goal: Electronic Component

Thermal Stability to improve reliability & component

operational lifetime

Past Research

Mission Requirements • Design based upon laboratory test system

( Slide 3)

• Power Requirements: ~10W from batteries

• High Voltage for EHD operation; current

Design Overview

Structural Overview

Electrical Overview

Block Diagrams

Payload Layout

User Guidelines Compliance

Structure Overview

• Payload consists of three (3) section

– EHD section

– Controls and data log section

– Power and reservoir section

• Platinum heaters located under EHD pump (slide 3)

• Silicon wafer over EHD pump for containment;

thickness

Electrical Overview

• Electrical systems initiated by G-switch upon launch • EHD requires HV but current

Electrical Block Diagram

Payload Layout

Battery

Reservoir

Controls Data Logger

Power

Management

EHD Experiment

RockSat-C Users Guidelines

Compliance

• EHD Based Thermal Control Experiment will take up

a full canister

• Usable space = 9.3” Dia. X 9.5” H

• Center of Gravity

– Payload must conform to a COG that lies within a 1x1x1 inch

envelope of the geometric centroid of the integrated canister

• Approx. weight

Management

Schedule

Team Organization

Faculty/Industry Mentors

Schedule Date

10/05/2012 Conceptual Design Review (CoDR) Due

10/17/2012

Online Progress Report 1 Due

10/26/2012

Preliminary Design Review (PDR) Due

11/9/2012

Online Progress Report 2 Due

11/(16 or 30)/2012

Critical Design Review (CDR) Due

1/18/2013

Final Down Select—Flights Awarded

1/25/2013

Online Progress Report 3 Due

2/15/2013

Individual Subsystem Testing Reports Due

3/12/2013

Online Progress Report 2 Due

3/29/2013

Payload Subsystem Integration and Testing Report Due

4/15/2013

RockSat Payload Canisters sent to customers

4/26/2013

First Full Mission Simulation Test Report Presentation Due

6/3/2013

Launch Readiness Review Presentations

6/12/2013

Travel to Wallops Flight Facility

6/(14-18)/2013

Integration/Vibration at Wallops

6/20/2013

Launch Day

• Team meetings will be held twice a week for the duration of the

design phase

• Meetings with GSFC will be every week for the duration of the

design phase

• Progress reports from each subgroup requested at the end of every

week.

Team Organization

Faculty/Industry Mentors

Kevin D Cole, PhD

• UNL AIAA Student Chapter Advisor since 2008

• Research on anemometers, fluid plow sensors, hot-

film resistors and properties of thermal protective

systems

• 2011 2012 NASA USLI and Lunabotics team advisor

Jeff Didion

• Senior Thermal Engineer Manager, MSD

Nanotechnology facility (GSFC)

Matt Showalter

• Associate Branch Head of the Advance

Manufacturing Branch (GSFC)

QUESTIONS?