eng Science and Education Publishing American Journal of Food Science and Technology 2333-4835 2019-08-09 7 6 189 194 10.12691/ajfst-7-6-4 AJFST2019764 article Inemesit Edem Ekop inemesitekop@aksu.edu.ng 1 Kayode Joshua Simonyan 2 Udochukwu Nelson Onwuka 2 Department of Agricultural Engineering, Faculty of Engineering, Akwa Ibom State University, Ikot Akpaden, P.M.B. 1167, Uyo, Akwa Ibom State, Nigeria. Department of Agricultural and Bioresources Engineering, College of Engineering and Engineering Technology, Michael Okpara University of Agriculture, Umudike, P.M.B 7262,Umuahia, Abia State, Nigeria This study was conducted to investigate and compare the thermal properties of two varieties: Tympanotonus fuscatus and Pachymelania aurita of Periwinkle in Nigeria. The thermal properties, namely; specific heat capacity,Cp, thermal conductivity, k, thermal diffusity,, thermal absorptivity, and thermal effusivity, of Periwinkle samples were determined. The mean thermal conductivity of T. fuscatus was found to be 0.085±0.00015 W/m.K at temperatures of 308 - 373 K, while that of P. aurita was 0.0952±0.00056 W/m.K at the same temperature range.The average specific heat capacity value of T. fuscatus was found to be 2403.663±3.4379 J/kg.K at temperature of 308 - 373 K lower than that of P. aurita having a mean value of 2832.314±1.7385 J/kg.K at the same temperature. The mean thermal diffisivity of T. fuscatus was found to be 2.6553×10-8 m2/s while that of P. aurita was found to be 5.6790×10-8 m2/s. The average values for thermal absorptivity and effusivity of T. fuscatus and P. aurita were obtained as 81.085m-1; 525.084 W.s1/2/m2K and 55.441 m-1; 396.952 W.s1/2/m2K, respectively. The results shown that average thermal absorptivity and effusivity values were higher in T. fuscatus than P. aurita. A Tukey pairwise comparison analysis carried out on the mean values of these thermal properties of T. fuscatus and P. aurita revealed that there is statistically significant difference at <5% between the thermal properties of the two varieties of periwinkle samples. These data would help us in predicting and controlling the heat flux during the design of periwinkle processing equipment. http://pubs.sciepub.com/ajfst/7/6/4/ajfst-7-6-4.pdf periwinkle varieties T fuscatus P aurita specific heat capacity thermal conductivity thermal diffusivity thermal properties