@incollection{fdi:010082433,
  title = {{E}stimation of steady water flux density in a porous medium by {F}ourier analysis of temperature variations in a cyclic heat pulse system},
  author = {{S}ousa, {E}.{F}. and {S}antolin, {M}.{A}. and {D}o, {F}r{\'e}d{\'e}ric},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e tested a novel theoretical model that determines the steady water flux density in a porous medium from {F}ourier analysis of temperature variations induced by a cyclic heat pulse system. {T}he model depends on the thermal diffusivity of the medium and on the  relative  spatial  variation  of  the  amplitude  and  phase  of  the  first  order  sinusoidal  component of the heat wave. {T}he model was tested by using a hydraulic column made of  a  {PVC}  pipe  filled  with  sawdust.  {T}he  sensor  consisted  of  two  hypodermic  needles  spaced 7 mm apart. {O}ne needle contained a heater and a thermocouple while the other contained  only  a  thermocouple.  {D}ifferent  combinations  of  heating  and  cooling  cycles  were tested. {T}he flow was controlled by pressure head and volumetrically measured at the  outlet  of  the  tube.  {T}he  experimental  results  supported  the  theoretical  model.  {I}n  particular,  the  convective  index  defined  in  terms  of  the  variations  of  amplitude  and  phase of the first component of the heat wave was linearly related to the measured flux density,  as  predicted.  {T}he  model  was  independent  of  the  different  combinations  of  heating and cooling cycles. {T}he estimated water flux density was strongly related to the measured flux density ({R}2>0.99), having the same slope for the different combinations. {T}he  first  results  of  this  new  approach  of  cyclic  heat  pulse  system  are  very  promising  and suggest further studies and field applications.},
  keywords = {},
  booktitle = {{P}roceedings of the {XI} international workshop on sap flow},
  numero = {1300},
  pages = {187--192},
  address = {{L}ouvain},
  publisher = {{ISHS}},
  series = {{A}cta {H}orticulturae},
  year = {2020},
  DOI = {10.17660/{A}cta{H}ortic.2020.1300.24},
  ISBN = { 978-94-6261-298-3},
  URL = {https://www.documentation.ird.fr/hor/fdi:010082433},
}