Thermohydraulic Performance of a Series of In-Line Noncircular Ducts in a Parallel Plate Channel

Table 2

Comparison of normalized pressure drop and module average Nusselt number for all the geometric tube shapes.

Module	Circular		Shape-1					Shape-2					Shape-3
		Nu0		/	Nu	Nu^+	Nu*		/	Nu	Nu^+	Nu*		/	Nu	Nu^+	Nu*
Re = 25
1	8.020	6.882	8.090	1.009	7.017	1.020	1.017	7.985	0.996	7.032	1.022	1.023	7.966	0.993	7.029	1.021	1.024
2	8.118	6.890	8.177	1.007	7.015	1.018	1.016	8.058	0.993	7.033	1.021	1.023	8.061	0.993	7.039	1.022	1.024
3	8.113	6.883	8.182	1.009	7.021	1.020	1.017	8.045	0.992	7.024	1.021	1.023	8.060	0.994	7.030	1.021	1.024
4	8.104	6.885	8.174	1.009	7.009	1.018	1.015	8.044	0.993	7.032	1.021	1.024	8.058	0.994	7.035	1.022	1.024
5	8.128	6.908	8.191	1.008	6.938	1.004	1.002	8.084	0.994	7.067	1.023	1.025	8.064	0.992	7.053	1.021	1.024
Re = 50
1	4.538	9.486	4.525	0.997	9.799	1.033	1.034	4.442	0.979	9.827	1.036	1.043	4.476	0.986	9.832	1.037	1.041
2	4.507	9.517	4.498	0.998	9.769	1.027	1.027	4.419	0.980	9.812	1.031	1.038	4.418	0.980	9.855	1.036	1.042
3	4.510	9.482	4.501	0.998	9.797	1.033	1.034	4.407	0.977	9.772	1.031	1.039	4.434	0.983	9.814	1.035	1.041
4	4.500	9.479	4.497	0.999	9.766	1.030	1.030	4.406	0.979	9.777	1.031	1.039	4.429	0.984	9.813	1.035	1.041
5	4.496	9.509	4.482	0.997	9.794	1.030	1.031	4.406	0.980	9.788	1.029	1.036	4.394	0.977	9.851	1.036	1.044
Re = 100
1	3.208	11.340	3.130	0.976	11.711	1.033	1.041	3.038	0.947	11.711	1.033	1.052	3.117	0.972	11.768	1.038	1.048
2	2.690	11.224	2.692	1.001	11.422	1.018	1.017	2.658	0.988	11.487	1.023	1.027	2.620	0.974	11.570	1.031	1.040
3	2.729	11.134	2.702	0.990	11.478	1.031	1.034	2.631	0.964	11.384	1.022	1.035	2.684	0.984	11.469	1.030	1.036
4	2.697	11.123	2.701	1.002	11.412	1.026	1.025	2.627	0.974	11.391	1.024	1.033	2.664	0.988	11.470	1.031	1.035
5	2.662	11.172	2.623	0.985	11.437	1.024	1.029	2.565	0.964	11.383	1.019	1.032	2.546	0.956	11.507	1.030	1.046
Re = 150
1	2.871	12.588	2.779	0.968	13.009	1.033	1.045	2.696	0.939	12.954	1.029	1.051	2.774	0.966	13.110	1.041	1.053
2	2.020	12.070	2.055	1.017	12.258	1.016	1.010	2.044	1.012	12.345	1.023	1.019	1.981	0.981	12.361	1.024	1.031
3	2.071	11.973	2.058	0.994	12.281	1.026	1.028	2.001	0.966	12.195	1.019	1.030	2.068	0.998	12.253	1.023	1.024
4	2.028	11.937	2.065	1.018	12.238	1.025	1.019	1.992	0.982	12.187	1.021	1.027	2.036	1.004	12.238	1.025	1.024
5	2.008	11.988	1.968	0.980	12.188	1.017	1.024	1.926	0.959	12.136	1.012	1.027	1.896	0.944	12.199	1.018	1.037
Re = 200
1	2.684	14.053	2.604	0.970	14.523	1.033	1.044	2.532	0.943	14.389	1.024	1.044	2.608	0.972	14.705	1.046	1.056
2	1.667	12.681	1.723	1.033	12.967	1.023	1.011	1.716	1.029	13.062	1.030	1.020	1.643	0.986	12.882	1.016	1.021
3	1.707	12.630	1.704	0.998	12.825	1.015	1.016	1.666	0.976	12.852	1.018	1.026	1.733	1.015	12.887	1.020	1.015
4	1.664	12.548	1.726	1.037	12.940	1.031	1.019	1.648	0.990	12.789	1.019	1.023	1.693	1.017	12.833	1.023	1.017
5	1.668	12.435	1.630	0.978	12.579	1.012	1.019	1.606	0.963	12.592	1.013	1.026	1.565	0.938	12.512	1.006	1.028
Re = 250
1	2.551	15.706	2.491	0.976	16.322	1.039	1.048	2.429	0.952	16.142	1.028	1.045	2.502	0.981	16.582	1.056	1.063
2	1.450	13.225	1.518	1.047	13.637	1.031	1.016	1.506	1.039	13.650	1.032	1.019	1.431	0.987	13.305	1.006	1.011
3	1.474	13.175	1.475	1.001	13.207	1.002	1.002	1.456	0.988	13.458	1.021	1.026	1.518	1.030	13.420	1.019	1.009
4	1.435	13.125	1.514	1.055	13.601	1.036	1.018	1.429	0.996	13.295	1.013	1.014	1.472	1.026	13.282	1.012	1.003
5	1.454	12.525	1.425	0.981	12.601	1.006	1.013	1.414	0.973	12.720	1.016	1.025	1.364	0.938	12.540	1.001	1.023
Re = 300
1	2.450	17.352	2.409	0.983	18.224	1.050	1.056	2.355	0.961	18.024	1.039	1.053	2.423	0.989	18.499	1.066	1.070
2	1.302	13.717	1.377	1.057	14.209	1.036	1.017	1.358	1.043	14.106	1.028	1.014	1.285	0.986	13.703	0.999	1.004
3	1.311	13.625	1.315	1.003	13.526	0.993	0.992	1.312	1.001	14.001	1.028	1.027	1.368	1.043	13.850	1.017	1.002
4	1.277	13.681	1.366	1.070	14.198	1.038	1.015	1.277	1.000	13.741	1.004	1.004	1.316	1.031	13.600	0.994	0.984
5	1.302	12.435	1.287	0.989	12.521	1.007	1.011	1.284	0.986	12.713	1.022	1.027	1.227	0.942	12.514	1.006	1.026
Re = 350
1	2.370	18.945	2.347	0.990	20.124	1.062	1.066	2.298	0.969	19.925	1.052	1.063	2.358	0.995	20.379	1.076	1.078
2	1.194	14.149	1.272	1.066	14.681	1.038	1.016	1.245	1.043	14.471	1.023	1.008	1.177	0.986	14.051	0.993	0.998
3	1.190	14.009	1.196	1.004	13.812	0.986	0.985	1.205	1.012	14.474	1.033	1.029	1.256	1.055	14.217	1.015	0.997
4	1.160	14.185	1.255	1.082	14.712	1.037	1.010	1.163	1.003	14.127	0.996	0.995	1.198	1.033	13.823	0.975	0.964
5	1.186	12.299	1.186	1.000	12.455	1.013	1.013	1.187	1.001	12.694	1.032	1.032	1.124	0.948	12.483	1.015	1.033