Skip to main content
SpringerLink
Log in

Application of liquid-crystal thermometry to drop temperature measurements

  • Originals
  • Published:
Experiments in Fluids Aims and scope Submit manuscript

Abstract

A technique has been developed that enables remote sensing of the temperatures of liquid drops in a medium of an immiscible, transparent liquid with the aid of dispersing microcapsules of thermochromic liquid crystal in each drop under illumination by either a planar floodlight or a light sheet which cuts the drop at a meridian. Based on appropriate hue-temperature calibrations made with an isothermal, stationary drop/medium system, one can analyze spatial and time variations of temperature within drops in motion under transient convective heating (or cooling) from the medium.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

Abbreviations

B :

tristimulus blue component

D :

drop diameter

G :

tristimulus green component

H :

hue angle

h 0 :

constant term in the expression for H

H m :

mean value of H over drop surface

h :

vertical coordinate fixed onto test column

R :

tristimulus red component

Re :

drop Reynolds number, UD/v c

r, g, b :

chromaticity coordinates

r :

drop radius

s :

penetration depth of light into drop

T :

temperature

T d :

instantaneous drop temperature

T d0:

initial drop temperature

T c :

continuous-phase temperature

U :

velocity of rise of drop

z :

vertical coordinate laid on drop

v c :

kinematic viscosity of continuous phase

θ :

angle of lighting measured from camera axis

θ s :

local view angle (azimuth)

φ :

polar angle

References

  • Abramzon B; Borde I (1980) Conjugate unsteady heat transfer from a droplet in creeping flow. AIChE J 26: 536–544

    Google Scholar 

  • Dabiri D; Gharib M (1991) Digital particle image thermometry: the method and implementation. Exp Fluids 11: 77–86

    Google Scholar 

  • Kaji N; Mori YH; Tochitani Y; Komotori K (1978) Direct-contact heat transfer to drops in an intermittent electric field. Proc 6th Int Heat Transfer Conf., Vol 3: 165–170

    Google Scholar 

  • Moresco LL; Marschall E (1979) Temperature measurements in a liquid-liquid direct-contact heat exchanger. AIChE Symp Ser 75: 266–272

    Google Scholar 

  • Rhee HS; Koseff JR; Street RL (1984) Flow visualization of a recirculating flow by rheoscopic liquid and liquid crystal techniques. Exp Fluids 2: 57–64

    Google Scholar 

  • Wilcox NA; Watson AT; Tatterson GB (1985) Color/temperature calibrations for temperature sensitive tracer particles. Proc Int Symp on Physical Flow Visualization, Albuquerque, N.M., 65–74

Download references

Author information

Authors and Affiliations

  1. Dept. of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, 223, Yokohama, Japan

    T. Nozaki

  2. Mechanical Engineering Research Laboratory, Hitachi, Ltd., 502 Kandatsu-cho, 300, Tsuchiura, Japan

    T. Mochizuki

  3. Dept. of Mechanical Engineering, The Polytechnic University, 4-1-1 Hashimoto-dai, 229, Sagamihara, Japan

    N. Kaji

  4. Dept. of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, 223, Yokohama, Japan

    Y. H. Mori

Authors
  1. T. Nozaki
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. T. Mochizuki
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. N. Kaji
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Y. H. Mori
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Nozaki, T., Mochizuki, T., Kaji, N. et al. Application of liquid-crystal thermometry to drop temperature measurements. Experiments in Fluids 18, 137–144 (1995). https://doi.org/10.1007/BF00230257

Download citation

  • Received:

  • Accepted:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00230257

Keywords

Search

Navigation