Numerical modeling for nanomaterial behavior in a solar unit analyzing entropy generation

Abstract

In current contribution, irreversibility and thermal treatment of nanomaterial though a quad-lobed tube equipped with helical tape were investigated. Two styles of tapes were employed: Single quad-channel twisted tape (SQCTT) and Dual quad-channel twisted tape (DQCTT) in which number of tape (TTn) were 1 and 2, respectively. In addition, Reynolds number (Re) and revolution of tape (N) have been assumed as variables. Verification based on previous article with involve of finite volume method, indicates the nice agreement of code. With rise of N, temperature of pipe and plates decreases about 3.94% and 5.05% when TTn=1 and other factors are minimum. Also, with assumption of minimum values of other factors, temperature of plates and tube reduces about 0.16% and 0.13% with rise of TTn. Assuming N = 4, DQCTT, augmenting the Re leads to 3.11% increase in Φs. Also, the highest impact of Re occurs for case with N = 4 and single tape in which 6.94% reduction was reported for Φs with augment of inlet velocity. Lowest decrement percentage with rise of N is about 0.48% which is occurred when Re=20,000 and DQCTT. When N = 4, Re=4000, Φs rises about 5.69% with replacing the DQCTT instead of SQCTT and this case has greatest impact of this parameter. Greatest and lowest impact on Be belong to Re and N, respectively. Rise of Re leads to decline in Be about 9.68% when TTn=2, N = 7. Growth of N results in 0.007% decrement in Be when N = 4, Re=4000. Greatest impact on component of irreversibility belongs to Re while the lowest impacts pertains the number of revolution. Selecting greater N leads to reduction in Sgen,th about 0.48% when TTn=2 and Re=20,000. Sgen,f experiences 35.58% augmentation with rise of TTn when N = 4, Re=4000.