Triple Tube Heat Exchangers (TTHEs) are suitable equipment for thick viscosity products , with or without particulates , with various applications in the food and pharmaceutical industries . Although less commonly used than Double Tube Heat Exchangers (DTHEs), TTHEs often perform better than DTHEs . With TTHEs it is possible to work simultaneously with co/counter-current flow arrangements and, usually, the fluid to be heated/cooled flows in the inner annulus, co/counter-currently to cooling/heating medium, in the inner tube and outer annulus . Due to these characteristics, this equipment has received wide attention in works with different approaches: experimental/theoretical (Batmaz and Sandeep , Peigné et al. , Ghiwala and Matawala , Wafelkar and Kamble , Linge et al. , Rădulescu et al. , Virani ); numerical (García-Valladares , Behera et al. , Quadir et al. , Al-Abidi et al. , Gomaa et al. , Giovannoni et al. , Singh and Jain ); and analytical (Zuritz , Ünal , Batmaz and Sandeep , Peigné et al. , Bertoli et al. ). In addition to these, other works are referenced in the review of Kumar and Hariprasath . Since this work focuses on an analytical solution, the main existing contributions are outlined below to identify the research gap to be addressed.