Analysis of Heat Transfers inside Counterflow Plate Heat Exchanger Augmented by an Auxiliary Fluid Flow

Table 3

Critical parameters for 𝜆_ℎ,max (*) and 𝜆_𝑐,max (**) as functions of 𝑎_ℎPe_ℎ and 𝑎_𝑐Pe_𝑐, respectively (0.01≤𝑎_𝑓≤0.25,0.12≤𝑎_𝑐Pe_𝑐≤0.6,0.5≤𝑎_ℎPe_ℎ≤2.14,0.05≤𝜙_𝑜≤0.5).

𝑎ℎPeℎ	𝑆	𝑎𝑓	𝑎𝑐Pe𝑐	Case with (19)		Case with (21)
				𝐿𝑜/𝐿	𝜙𝑜	𝐵	𝜙𝑜
0.05	0.25	0.25	0.12	0.4	0.466	−5.342	0.146
0.05	0.5	0.25	0.12	0.4	0.466	−5.342	0.146
2.05	0.25	0.25	0.12	0.75	0.194	−15.93	0.058
2.05	0.5	0.25	0.12	0.75	0.194	−15.93	0.058
𝑎𝑐Pe𝑐	𝑆	𝑎𝑓	𝑎ℎPeℎ	𝐿𝑜/𝐿	𝜙𝑜	𝐵	𝜙𝑜
0.12	0.25	0.25	0.05	0.4	0.466	−6.865	0.114
0.12	0.5	0.25	0.05	0.4	0.466	−6.865	0.114
2.05	0.25	0.25	0.05	0.75	0.194	−15.93	0.05
2.05	0.5	0.25	0.05	0.75	0.194	−15.93	0.05

(∗) The parameters that produce 𝜆_𝑐,max are 𝑎_𝑐Pe_𝑐=0.6 and (𝐿_𝑜/𝐿=0.75,𝜙_𝑜=0.194) for the case given by (19) while (𝐵=−10.62,𝜙_𝑜=0.074) for the case given by (21)
(**) The parameters that produce 𝜆_ℎ,max are 𝑎_ℎPe_ℎ=2.14 and (𝐿_𝑜/𝐿=0.75,𝜙_𝑜=0.194) for the case given by (19) while (𝐵=−15.93,𝜙_𝑜=0.05) for case given by (21).