Inlet and outlet pipe heat interaction in a contiguous flight auger (CFA) pile - Sani, Abubakar Kawuwa; Singh, Rao Martand; Cavarretta, Ignazio; Tsuha, Cristina de Hollanda Cavalcanti; Bhattacharya, Subhamoy (International Symposium on Energy Geotechnics - SEG 2018, 2019)