DC Water Film Motor

In collaboration with Medical Physics Lab (Dr. Amjadi) and Non-Equilibrium Systems Group (Dr. Tabar).

Introduction

This page is dedicated to the research concerning a novel mechanism of water film rotation. The device consists of a two-dimensional cell used for electrolysis of water films, as simple as an insulator frame with two electrodes on the sides, to which an external in-plane electric field E, perpendicular to the mean electrolysis current density J, is applied.

Publications

2006

[1] R. Shirsavar, A. Amjadi, N. Hamedani Radja, M. D. Niry, M. Reza Rahimi Tabar, M. R. Ejtehadi
A water film motor, to be submitted.

Movies

The movie shows the film rotation under variant electric field and/or electrolysis voltage. Following table indicates the values during the experiment.

Time

‎0‎

‎2‎

‎4‎

‎5‎

‎7‎

‎11‎

‎14‎

‎15‎

‎17‎

‎27‎

‎29‎

‎31‎

Electrolysis voltage (V)‎

Off

‎+400‎

Off

‎+400‎

Off

‎-400‎

Off

‎-400‎

Off

‎+400‎

Electric field(kV/m)‎

‎36‎

from 36 to 129‎

‎129‎

Electrolysis cell dimensions: 12 ×15 mm2
Glycerin volume fraction: 0.375

The movie shows the film rotation under variant electric field and/or electrolysis voltage. Following table indicates the values during the experiment.

Time(s)‎	‎0‎	‎1‎	‎+1‎	‎5	‎+5‎	‎10‎	‎+10‎	‎14‎	‎25	‎32‎	‎33‎
Electrolysis voltage(V)‎	‎+536‎	Off	‎+536‎	Off	‎-536‎	Off	‎-536‎	‎-536‎	‎-536‎	Off	‎+536‎
Electric field(kV/m)‎	‎36‎	‎36‎	‎36‎	‎36‎	‎36‎	‎36‎	‎36‎	from 36 to 129‎	‎129‎	‎129‎	‎129‎

Electrolysis cell dimensions: 12 ×15 mm2
Glycerin volume fraction: 0.375

The movie shows the instance that external electric field passes threshold and rotation starts.
Electrolysis cell dimensions: 31 × 31 mm2
Glycerin volume fraction: 0.02

Rotation in a rectangular electrolysis frame. It shows how boundary conditions controls the number and shape of vortices.

Time(s)‎	‎0‎	‎2‎	‎12‎	‎15	‎23‎	‎26‎	‎34	‎37‎	‎41‎	‎56
Electrolysis Voltage(V)‎	Off	‎176‎	Off	‎176‎	Off	‎-176‎	Off	‎-176‎	‎-176‎	‎-176‎
Electric Field(kV/m)‎	‎36‎	‎36‎	‎36‎	‎36‎	‎36‎	‎36‎	‎36‎	‎36‎	from 36 to 144‎	‎144‎

Electrolysis cell dimensions: 10 ×31 mm2
Glycerin volume fraction: 0.375

A 30 × 50 mm2 electrolysis cell is partitioned to about 10 × 10 mm2 squares using cotton string.

Time(s)‎	‎0	‎1‎	‎9	‎10‎	‎15‎	‎20	‎33‎	‎34‎	‎44
Electrolysis voltage(V)‎	Off	‎+528‎	Off	‎+528‎	‎+528‎	‎+528‎	Off	‎-528‎	‎-528‎
Electric field(kV/m)‎	‎62.5‎	‎62.5‎	‎62.5‎	‎62.5‎	62.5 to 125‎	‎125‎	‎125‎	‎125‎	125 to ‎zero

Electrolysis voltage: 120 V
Electric field: 60 kV/m
Electrolysis cell dimensions: 31 × 31 mm2
Glycerin volume fraction: 0.14
Electrolysis voltage: 120 V
Electric field: 60 kV/m
Electrolysis cell dimensions: 31 × 31 mm2
Glycerin volume fraction: 0.22
A 30 × 50 mm2 electrolysis cell is partitioned to about 10 × 10 mm2 squares using cotton string. The movie has been recorded approximately 5 minutes after the rotation has been started.