GB1465057A - Devices for indicating a change in physical state of a fluid substance - Google Patents

Devices for indicating a change in physical state of a fluid substance

Info

Publication number
GB1465057A
GB1465057A GB2856473A GB2856473A GB1465057A GB 1465057 A GB1465057 A GB 1465057A GB 2856473 A GB2856473 A GB 2856473A GB 2856473 A GB2856473 A GB 2856473A GB 1465057 A GB1465057 A GB 1465057A
Authority
GB
United Kingdom
Prior art keywords
stream
air
temperature
heat
ice
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2856473A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hawker Siddeley Dynamics Ltd
Original Assignee
Hawker Siddeley Dynamics Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hawker Siddeley Dynamics Ltd filed Critical Hawker Siddeley Dynamics Ltd
Priority to GB2856473A priority Critical patent/GB1465057A/en
Publication of GB1465057A publication Critical patent/GB1465057A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content
    • G01N25/58—Investigating or analyzing materials by the use of thermal means by investigating moisture content by measuring changes of properties of the material due to heat, cold or expansion
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/02—Means for indicating or recording specially adapted for thermometers
    • G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity

Abstract

1465057 Detecting physical change of state in a fluid stream HAWKER SIDDELEY DYNAMICS Ltd 17 June 1974 [15 June 1973] 28564/73 Heading G1N Apparatus for this comprises a surface 1 in the stream, a Peltier effect heat pump 2 to keep the surface closer to the temperature at which the change occurs than the stream by a temperature difference #t, means 3, 4 to detect #t, means 11 to adjust the power input to the pump in response to the detected signal to keep #t approximately constant, means 14 monitoring this power input and generating an output control signal when it changes in a predetermined way. Tube 15 is parallel to the air-stream in duct 16. Junction 4 of a thermocouple senses air-stream temperature and junction 3 is in contact with surface 1 around which semi-conducting heat pump elements 2 are spaced equiangularly in a ring. 1 and 5 are thin electrically-insulating films. Control box 7 mounted on duct wall 17 contains electrical components. Amplifier 11 is connected to elements 2 via conducting segments 12 and leads 6, which with thermocouple leads 13 pass through support strut 8. A decrease in #t is minimized by elements 2, increasing their transference of heat from surface 1 to hot surface 5 cooled by the air-stream. When ice forms on surface 1, initial release of latent heat causes a raised heat-transfer coefficient and thus the amplifier output to rise, but rapid blocking by ice then insulates surface 1 and causes the amplifier output to become very low. Generator 14 generates a signal for an air-stream temperature control whenever a large drop in output occurs. On the subsequent rise of air-stream temperature, the amplifier output reverses and the heat pump reverses to melt the ice. The device may be part of an aircraft-air conditioning system. Other uses are for warning of deposition of heavy oil fractions or of condensation in a gas flow or of boiling in a liquid, for which surface 1 is a hot surface.
GB2856473A 1974-06-17 1974-06-17 Devices for indicating a change in physical state of a fluid substance Expired GB1465057A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2856473A GB1465057A (en) 1974-06-17 1974-06-17 Devices for indicating a change in physical state of a fluid substance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2856473A GB1465057A (en) 1974-06-17 1974-06-17 Devices for indicating a change in physical state of a fluid substance

Publications (1)

Publication Number Publication Date
GB1465057A true GB1465057A (en) 1977-02-23

Family

ID=10277626

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2856473A Expired GB1465057A (en) 1974-06-17 1974-06-17 Devices for indicating a change in physical state of a fluid substance

Country Status (1)

Country Link
GB (1) GB1465057A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2680572A1 (en) * 1991-08-19 1993-02-26 Auxitrol Temperature probe for gas flow
CN106645276A (en) * 2016-09-30 2017-05-10 西安工程大学 Device and method for measuring local heat transfer coefficient of surface of ice column of iced conductor
CN111595386A (en) * 2020-06-12 2020-08-28 中国民航大学 Runway accumulated ice autonomous sensing device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2680572A1 (en) * 1991-08-19 1993-02-26 Auxitrol Temperature probe for gas flow
CN106645276A (en) * 2016-09-30 2017-05-10 西安工程大学 Device and method for measuring local heat transfer coefficient of surface of ice column of iced conductor
CN106645276B (en) * 2016-09-30 2019-06-21 西安工程大学 A kind of measurement method of ice coating wire icicle surface Local Condensing Heat Transfer Coefficients
CN111595386A (en) * 2020-06-12 2020-08-28 中国民航大学 Runway accumulated ice autonomous sensing device

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee