Thermal studies on the solid–liquid phase transition in binary systems of fatty acids

Zhang, Jianjun; Zhang, Jianling; He, Shan; Wu, Kezhong; Liu, Xiaodi

doi:10.1016/s0040-6031(00)00766-8

Cited by 90 publications

(25 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As can be seen from Table 2, the values of K S obtained in present work for LA, MA, and PA are about twice of the values of K S obtained in previous works [31][32][33][36][37][38][39][40][41][42][43] with the Differential Scanning Colorimeter (DSC) method for same acids, but the value of K S obtained in present work for SA is in a good agreement with the values of K S obtained in previous works [34,35] with hot-wire method for same acid. It can be also seen from Table 2, the values of K L obtained in present work for LA, MA, PA, and SA are in a good agreement with the values of K L obtained in previous works [31][32][33][34][35][36][37][38][39][40][41] with the DSC method for same acids. The study of the thermal conductivity variation with temperature for phase change material (PCM) is given in References [43][44][45][46].…”

Section: Resultssupporting

confidence: 60%

“…A comparison of the values of K S and K L obtained in present work with the values of K S and K L obtained in previous works [31][32][33][34][35][36][37][38][39][40][41][42][43] with the Differential Scanning Calorimeter (DSC) and hot-wire methods for fatty acids i.e., LA, MA, PA, and SA is also given in Table 2. In the DSC measurements, a transition curve from solid state to liquid state is obtained by heating a sample with a constant heating rate and then the thermal conductivity of solid is determined from the transition curve at the melting temperature.…”

Section: Resultsmentioning

confidence: 61%

See 1 more Smart Citation

Temperature dependency of thermal conductivity of solid phases for fatty acids

Bayram

Aksöz

Maraşlı

2014

J Therm Anal Calorim

View full text Add to dashboard Cite

Thermal conductivity variations with temperature of solid phases for lauric acid (LA), myristic acid (MA), pivalic acid (PA), and stearic acid (SA) have been measured with radial heat-flow method. Temperature dependencies of the thermal conductivity for same organic materials have been obtained by linear regression analysis. From graphs of thermal conductivity versus temperature, the thermal conductivity of solid phase at their melting temperature and temperature coefficients of thermal conductivity for LA, MA, PA, and SA have been found to be 0.37, 0.39, 0.23, and 0.35 W K -1 m -1 and 0.00935, 0.00446, 0.01095, and 0.00295 K -1 , respectively. The ratios of thermal conductivity of liquid phase to thermal conductivity of solid phase for LA, MA, PA, and SA have also been measured to be 0.52, 0.48, 0.25, and 0.59, respectively, with a Bridgman-type directional solidification apparatus.

show abstract

Section: Resultssupporting

confidence: 60%

Section: Resultsmentioning

confidence: 61%

Temperature dependency of thermal conductivity of solid phases for fatty acids

Bayram

Aksöz

Maraşlı

2014

J Therm Anal Calorim

View full text Add to dashboard Cite

show abstract

“…Ten different DSC instruments were used to obtain the thermal data of these organic eutectics, but only Zhang et al [31] and Nikolic et al [38] also used the DSC to cycle the samples. The other studies performed the cycling tests using different equipment and setup configurations.…”

Section: Organic Eutecticsmentioning

confidence: 99%

Review on the methodology used in thermal stability characterization of phase change materials

Ferrer

Solé

Barreneche

et al. 2015

Renewable and Sustainable Energy Reviews

118

View full text Add to dashboard Cite

a b s t r a c tIn general, PCM are classified in organic and inorganic groups or families. First group mainly encloses paraffin, fatty acids, and sugar alcohols. Inorganic are mostly represented by salt hydrates, salt solutions, and metals. Eutectics and mixtures are also being formulated to obtain a desired phase change temperature. One of the most important PCM requirements is being stable after a number of repeated melting/freezing cycles, which is known as cycling stability. A PCM should present the same or almost the same thermal, chemical and physical properties after a repeated number of freezing and melting cycles. Thermal cycling tests results and detailed tests procedures are classified by PCM type in this review. Moreover, the parameters that must be considered in order to perform cycling stability tests are highlighted depending on the importance they have on the following four issues: the choice of the equipment to perform the cycling tests; the selection of the techniques to characterize the PCM before and after thermal cycling test and to follow the PCM thermal degradation; the definition of the number of cycles to perform; and finally, the choice of the heating rate and thermal cycling method (pyramid, or dynamic, or others) to perform the tests. It is mandatory to conclude that, based on the literature reviewed, no common standard for thermal cycling stability tests is available at the moment.

show abstract

“…Jotshi performed experiments to study 1100 thermal cycles of ammonium alum/ammonium nitrate eutectic and reported that after thermal cycles, the enthalpy change was 5% lower than up to its initial value [5]. Zhang et al investigated the stability of the binary mixtures of fatty acids after 30, 50, 80 and 100 melt/freeze cycles and suggested to use in storage applications due to the stable thermal properties [6].…”

Section: Introductionmentioning

confidence: 99%

“…Based on the literature survey [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] as mentioned above, a comprehensive knowledge of the thermal stability of the PCMs as a function of repeated thermal cycles is essential for assurance of the long-term performance in a latent heat storage system. In this regard, the main objectives of this research study is to see the changes in melting temperatures and latent heat of fusion of developed binary mixture if any.…”

Section: Introductionmentioning

confidence: 99%