Abstract
In this study a group method of data handling model has been successfully developed to predict heat capacity of ionic liquid based nanofluids by considering reduced temperature, acentric factor and molecular weight of ionic liquids, and nanoparticle concentration as input parameters. In order to accomplish modeling, 528 experimental data points extracted from the literature have been divided into training and testing subsets. The training set has been used to predict model coefficients and the testing set has been applied for model validation. The ability and accuracy of developed model, has been evaluated by comparison of model predictions with experimental values using different statistical parameters such as coefficient of determination, mean square error and mean absolute percentage error. The mean absolute percentage error of developed model for training and testing sets are 1.38% and 1.66%, respectively, which indicate excellent agreement between model predictions and experimental data. Also, the results estimated by the developed GMDH model exhibit a higher accuracy when compared to the available theoretical correlations.
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Abbreviations
- ai :
-
unknown coefficient of polynomial
- a :
-
vector of quadratic polynomial coefficients
- A:
-
coefficients matrix
- Cp:
-
heat capacity, kJ/(kg.K)
- \( \widehat{f} \) :
-
approximated function
- GMDH:
-
group method of data handling
- M:
-
number of observation
- MAPE:
-
mean absolute percentage error
- MSE:
-
mean square error
- Mw:
-
molecular weight, gr/grmol
- NEILs:
-
nanoparticle enhanced ionic liquids
- n:
-
number of experimental data points
- R2 :
-
coefficient of determination
- T:
-
temperature, K
- Tc:
-
critical temperature, K
- Tr:
-
reduced temperature \( \left({T}_r=\raisebox{1ex}{$ T$}\!\left/ \!\raisebox{-1ex}{${T}_c$}\right.\right) \)
- U:
-
third middle layer function
- W:
-
first middle layer function
- xi :
-
input parameter
- X:
-
vector of input parameters
- y:
-
output value
- \( \overset{-}{\mathrm{y}} \) :
-
average value of output
- ŷ:
-
predicted output
- Y:
-
vector of target values
- Z:
-
second middle layer function
- ρ :
-
density, kg/m3
- φ:
-
nanoparticle concentration, vol%
- ω :
-
acentric factor
- cal:
-
model predictions
- exp:
-
experimental value
- f:
-
fluid
- NEIL:
-
nanoparticle enhanced ionic liquid
- nf:
-
nanofluid
- np:
-
nanoparticle
- IL:
-
ionic liquid
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Sadi, M. Determination of heat capacity of ionic liquid based nanofluids using group method of data handling technique. Heat Mass Transfer 54, 49–57 (2018). https://doi.org/10.1007/s00231-017-2091-7
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DOI: https://doi.org/10.1007/s00231-017-2091-7