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ESTIMATION of CONVECTIVE HEAT TRANSFER BETWEEN FLUID and PARTICLE IN CONTINUOUS FLOW USING A REMOTE TEMPERATURE SENSOR 1
Author(s) -
BALASUBRAMANIAM V.M.,
SASTRY S.K.
Publication year - 1996
Publication title -
journal of food process engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 45
eISSN - 1745-4530
pISSN - 0145-8876
DOI - 10.1111/j.1745-4530.1996.tb00391.x
Subject(s) - nusselt number , reynolds number , heat transfer , fluid dynamics , heat transfer coefficient , particle (ecology) , viscosity , mechanics , convection , convective heat transfer , thermodynamics , materials science , chemistry , analytical chemistry (journal) , physics , chromatography , geology , oceanography , turbulence
The convective heat transfer coefficient (h fp ) between fluid and particle in continuous tube flow was estimated using a temperature pill, a remote electronic temperature sensor which uses a quartz crystal as the temperature sensing element. the temperature history of a particle (with temperature pill mounted within) was monitored as it moved through a test section. A finite element algorithm was then used to back calculate h fp from the time‐temperature data. the value of h fp ranged from 134 W/m 2 K to 669 W/m 2 K (Nu=3.6 to 17.3) over a fluid generalized Reynolds number range (restricted by experimental constraints) from 19 to 196.8. As expected, h fp decreased with increasing carrier medium viscosity and increased with increasing flow rates. Even with several conservative factors at play, the lowest Nusselt number was greater than the 2.0 expected for a spherical particle in a stagnant fluid. Potential applications of the technique include noninvasive measurement of the temperature (and h fp values) of the particles moving within a fluid stream in otherwise inaccessible locations.