A B C D E F G H I
IAEA ICE CONDENSER CONTAINMENTS, FOR NUCLEAR REACTOR ICE DRIFT ICHEME ICING IDEAL DIODE LAW IDEAL GAS IDEAL GAS LAW IDEAL MIXTURE IDEAL PLASMA IDEAL SOLUTIONS Identification procedure IEA IEE IFRF IGNITION, EXPLOSION Ill-posedness of inverse problems IMAGE SEQUENCE PROCESSING IMECHE Immersed Bodies, Flow Around and Drag IMMERSED BODIES, HEAT TRANSFER AND MASS TRANSFER IMMERSED JETS IMMISCIBLE LIQUIDS IMMISCIBLE LIQUIDS, BOILING HEAT TRANSFER IMPACT OF PARTICLES ON SURFACE IMPACTING SPRAYS IMPEDANCE METHOD FOR VOID FRACTIONS IMPELLER MIXERS IMPELLERS IMPINGEMENT SEPARATORS IMPINGING JETS IMPINGING SPRAYS IMPULSE TURBINES IMPULSES IMPURITIES IN CRYSTALS IN-LINE MIXERS IN-LINE TUBE BANKS INCINERATION INCLINED CHANNEL INCLINED TUBE BANKS INCLINED TUBES INCLINED WALLS INCLUSIONS INCOMPLETE GAMMA FUNCTION INCOMPRESSIBLE FLUID INDEFINITE INTEGRALS INDETERMINATE-ORIGIN NOZZLE JETS INDUCED DRAFT AIR COOLED HEAT EXCHANGERS INDUCTION HEATING INDUSTRIAL AERODYNAMICS INDUSTRIAL FUSION REACTORS INERT GASES INERTIAL CONFINEMENT REACTORS INERTIAL REFERENCE FRAMES INERTIAL SEPARATORS INFINITE SERIES INFINITE TRIGONOMETRIC SERIES INFLUENCE INFRA-RED DRYING INFRA-RED IMAGING INFRA-RED PHOTOGRAPHY INFRA-RED RADIATION INFRA-RED SPECTROSCOPY Infrared properties of carbon fibers Infrared spectra of molecules INGRESS INJECTION INLET EFFECTS IN CHANNEL FLOW INSTABILITIES IN LAMINAR FLOW INSTABILITIES IN TWO-PHASE SYSTEMS INSTABILITY Instability and Turbulence INSTABILITY OF SLIP FLOW INSTITUTE OF ENERGY, IoE INSTITUTION OF CHEMICAL ENGINEERS, ICHEME INSTITUTION OF ELECTRICAL ENGINEERS, IEE INSTITUTION OF MECHANICAL ENGINEERS, IMECHE INSULATION INSULATORS, ELECTRICAL INTEGRAL CONDENSATION CURVE INTEGRAL EQUATIONS INTEGRALS INTEGRATION BY PARTS INTEGRO-DIFFERENTIAL EQUATIONS INTENSE FORMATION OF HIGHER SILANES IN THE GAS PHASE INTENSIFICATION OF HEAT TRANSFER INTENSITY OF RADIATIVE ENERGY TRANSPORT INTER-DIFFUSION COEFFICIENT INTERFACE HEAT TRANSFER COEFFICIENT INTERFACE MASS TRANSFER COEFFICIENT INTERFACE STRUCTURE INFLUENCE INTERFACE TEMPERATURE DROP INTERFACE TRACKING SIMULATION OF BUBBLES Interfaces INTERFACIAL AREA INTERFACIAL CHARACTERISTICS INTERFACIAL FLOWS INTERFACIAL FRICTION FACTOR INTERFACIAL JUMP CONDITIONS INTERFACIAL MOMENTUM TRANSFER INTERFACIAL RESISTANCE INTERFACIAL SHEAR STRESS INTERFACIAL TENSION INTERFERENCE INTERFERENCE TECHNIQUES INTERFEROMETRY INTERMITTENCY INTERMITTENT FLOW INTERMOLECULAR FORCES INTERMOLECULAR PAIR POTENTIAL INTERMOLECULAR POTENTIALS INTERNAL COILS INTERNAL COMBUSTION ENGINES INTERNAL ENERGY Internal Flows INTERNAL HEAT GENERATION IN A TALL CAVITY INTERNAL REBOILERS INTERNATIONAL ATOMIC ENERGY AGENCY, IAEA INTERNATIONAL ENERGY AGENCY, IEA INTERNATIONAL FLAME RESEARCH FOUNDATION, IFRF INTERNATIONAL TEMPERATURE SCALE INUNDATION INUNDATION, EFFECT ON CONDENSATION INVERSE ANNULAR FLOW Inverse design of enclosures with participating media and multimode heat transfer INVERSE PROBLEM Inverse problems in radiation transfer INVERSE SOLUTIONS OF A SECOND-GRADE MAGNETOHYDRODYNAMIC ALIGNED FLUID FLOW INVERSION LAYER, EFFECT ON POLLUTION INVERSION POINT INVERSION POINT TEMPERATURE Inviscid Flow IoE ION EXCHANGE IONIC BONDING IONIC CONTINUA IONIZATION IONIZING RADIATION IONS IONS, TRANSPORT IN ELECTROLYTE IOTVOS NUMBER IRON IRREVERSIBILITY IRREVERSIBLE PROCESSES IRREVERSIBLE THERMODYNAMICS IRRIGATION GUN Irrotational Flow ISENTROPIC EXPONENT ISENTROPIC PROCESSES ISO-BUTANE ISO-OCTANE ISO-PROPANOL ISOBAR ISOBARIC JET ISOCHORE ISOELECTRIC POINTS ISOENTHALPIC PROCESS ISOGONAL MAPPING ISOTACH OR ISOVEL ISOTHERM ISOTHERMAL PROCESS ISOTOPES ITERATIVE METHOD
J K L M N O P Q R S T U V W X Y Z

ISOTHERMAL PROCESS

Interlinking between Articles
Visual Navigation

'Isothermal' means at constant temperature. In a strict sense, an isothermal process must be a reversible process because by definition, if every part of the system is at the same, constant temperature throughout the process, there can be no frictional or other irreversible effects giving rise to heat and causing local changes in temperature [see, for example, Rogers and Mayhew (1992)]. No real process can be perfectly isothermal, some come very close, especially if it is accepted that it is only the spatially-averaged temperature which must remain constant.

In processes operating on a single phase, heat transfer will result in a change in temperature unless exactly balanced by some other energy transfer, e.g., work, and this balance can be very difficult to achieve in practice. One solution might be to eliminate the heat transfer: but in reality, insulation can reduce heat transfer but cannot stop heat transfer completely. An alternative approach is to use systems which can accept some heat transfer without a change in temperature.

In two-phase systems, heat transfer can be accommodated without changing the temperature by altering the relative amounts of the two phases present. The most common example is a phase equilibrium in a pure substance at constant pressure. Ice in water is frequently used as a fixed point for temperature because this system remains at a constant temperature provided the pressure is constant and the rate of heat transfer is not sufficient to cause the system to depart significantly from equilibrium.

REFERENCES

Rogers, G. F. C. and Mayhew, Y. R, (1992) Engineering Thermodynamics: Work and Heat Transfer: SI units 4th edn. Longman Group UK Ltd., Harlow, Essex. DOI: 10.1016/0009-2509(93)80061-T

References

  1. Rogers, G. F. C. and Mayhew, Y. R, (1992) Engineering Thermodynamics: Work and Heat Transfer: SI units 4th edn. Longman Group UK Ltd., Harlow, Essex. DOI: 10.1016/0009-2509(93)80061-T

Following from:

THERMODYNAMICS

This article belongs to the following areas:

I in A-Z Index
Number of views: 4935 Article added: 2 February 2011 Article last modified: 13 February 2011 © Copyright 2010-2014 Back to top